The temperature coefficient of resistivity of metal
10 = r0(1 + 20k)
10.5 = r0(1 + 90k);
10.5/10 = (1 + 90k)/(1 + 20k);
10.5 + 210k = 10 + 900k
k = 0.5/690 = 7.25·10-4 1/C
The primary unit of temperature within the worldwide gadget of units (SI) is the kelvin. It has the sign K . For normal programs, it's far often handy to use the Celsius scale, in which 0 °C corresponds very carefully to the freezing factor of water and a 100 °C is its boiling factor at sea level.
Temperature is a measure of the common kinetic energy of the debris in an object. While the temperature increases, the movement of those particles also will increase. Temperature is measured with the thermometer or calorimeter.
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which message travels faster - the one that travels along the surface of the axon or the one that jumps from node to node? group of answer choices
In case of node to node, the message travels faster. Our brain can exchange signals with our toes in a few thousandths of a second by jumping signals hundreds of times quicker than signals that travel along the surface of the axon.
Which axon conducts impulses most quickly ?The speed of nerve impulse conduction is accelerated by the presence of a myelin sheath. Similar unmyelinated axons conduct impulses about ten times slower than myelinated ones do.
Action potentials "jump" from node to node as they move down the axon. The term saltatory conduction, which means "to leap," describes this. Moving in an axon with myelin is slower than traveling along an axon through saltatory conduction.
E. myelinated neurons conduct impulses at the quickest speeds. A fatty layer called myelin surrounds the neuronal axon. When compared to continuous conduction on unmyelinated axons, saltatory conduction on myelinated axons is a faster and more energy-efficient type of impulse conduction.
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for a metal that has an electrical conductivity of 6.1 × 107 (ω·m)−1, what is the resistance of a wire that is 4.3 mm in diameter and 8.1 m long?
The resistance of the wire with a diameter of 4.3 mm and a length of 8.1 m is 9.14*10⁻³ Ω
What is an illustration of resistance?Resistance is defined as a refusal to give up to something that prevents or slows down anything. A child fighting her abductor is an example of resistance. An example of resistance is the wind pushing up against an airplane's wings.
Briefing:We can calculate the resistance as follows:
R = 1/σ . L / A, where:
l is the wire's length, σ is the electrical conductivity, and A is its cross-section (assumed circular).
By modifying the values, we may determine R as follows:
R = 1/6.1. 10⁷ (Ω.m) . 8.1 m. / π (0.0043)² m / 4
= 9.14 . 10⁻³ Ω
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The complete question is-
For a metal that has an electrical conductivity of 6.1 × 10⁷ (Ω∙m)⁻¹, what is the resistance of a wire that is 4.3 mm in diameter and 8.1 m long?
(A) 3.93 × 10⁻⁵ Ω
(B) 2.29 × 10⁻³ Ω
(C) 9.14 × 10⁻³ Ω
(D) 1.46 × 10¹¹ Ω
establish an order-of-magnitude criterion which shows in what range of radius the flow may be regarded as inertia-free. express your criterion in terms of q and h together with any other necessary quantities
The standard way to express an order of magnitude is as 10 to the nth power where q/h is 0.01.
Order of magnitude is the number of powers of 10 in a number or the number of powers of 0.1 in a negative number. The order of magnitude is represented by the n.A number is effectively multiplied by 10 if it is raised by one order of magnitude. A number is essentially multiplied by 0.1 if it is decreased by one order of magnitude.Protons and neutrons make up the atom's tiny, dense nucleus, which is located inside each atom. A nucleus may have a spherical, triaxial, pear-shaped, or rugby ball-like shape. Due to negligibly small contributions from the electron cloud surrounding it, an atom's nucleus almost makes up its entire mass. The protons and neutrons come together to form a nucleus due to nuclear force. In comparison to an atom, a nucleus diameter is significantly smaller.To learn more about electron cloud-
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a student finds the mass of a pure sample of a metal chloride hydrate. the student heats the sample several times, reaching a constant mass that contains 0.100 mole of anhydrous metal chloride. which of the following questions about the hydrated metal chloride substance is most likely to be answered by the results of the experiment?
Answer:How many moles of water are in one mole of the substance?
Explanation:
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, "How many moles of water are in one mole of the substance".
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number.
Mathematically,
mole =given mass ÷ molar mass
A student finds the mass of a pure sample of a metal chloride hydrate. the student heats the sample several times, reaching a constant mass that contains 0.100 mole of anhydrous metal chloride. The most important question that can be asked from this experiment is "How many moles of water are in one mole of the substance".
Therefore, "How many moles of water are in one mole of the substance".
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you are heading toward an island in your speedboat when you see a friend standing on shore at the base of a cliff. you sound the boat's horn to get your friend's attention. let the frequency of the sound produced by the horn be f1f1, the frequency as heard by your friend be f2f2, and the frequency of the echo as heard on the boat be f3f3.
The Wavelength will be higher than what will be heard without any motion on the boat due to the Doppler Effect, which is the change in the frequency of a sound wave whenever there's a relative motion between the source of the wave and observer. The amount of shift in frequency depends on the speed of the source towards the observer; the higher the velocity of the source, the higher the shift.
Doppler effect is the shift in frequency as the object gets near an object/person or far away from an object or person.
When the frequency of a police car is heard from far away, the frequency is low and long wave lengths
When the frequency of a police car is heard from near, the frequency is high and short-wave lengths
Therefore, the Doppler effect is observed when the distance between
the source and the observer is changing.
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a diverging lens has a focal length of magnitude 20.0 cm. (a) locate the images for object distances of (i) 40.0 cm, (ii) 20.0 cm, and (iii) 10.0 cm. for each case, state whether the image is (b) real or virtual and (c) upright or inverted. (d) for each case, find the magnification.
It is only necessary to know the direction of two of the three rays in order to graphically depict the formation of an image in a thin lens with virtual image.
(i) The one that strikes the lens perpendicular to the optical axis of the lens is one of them. When this is refracted in the lens, the image focus will not be affected. Its trajectory won't be altered by this.
(ii) The third and final one is the one that crosses the object focus (or its extension does), which, following refraction, will move in a direction parallel to the optical axis of the lens.
Accordingly, depending on how an object or body is positioned in relation to the lens, one type of image will generally be formed in the lenses. The image will always be virtual, smaller than the body, and to the right in divergent lenses.
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If the sun mysteriously gets twice as massive as it is right now, what effect will it have on its pull on mars?.
Effect it will have on its pull on mars will be twice as much
What would happen if the sun were twice as massive ?On average, the Sun is 93 million miles from Earth, but it is still essential to sustaining life as we know it.
If it were to decrease, grow, or change in any way, we would undoubtedly see significant changes in our lives.
The majority of people concur that the solar system's central star, the sun, is the source of the energy that powers planet Earth.
The light and heat that our star emits, which also contribute to the emergence of life on Earth, are used to build our climate and weather systems.
The length of a year is also influenced by the sun's gravitational pull, which is subject to our control.
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A 0.260 kg potato is tied to a string with length 2.50 m, and the other end of the string is tied to a rigid support. The potato is held straight out horizontally from the point of support, with the string pulled taut, and is then released.A) What is the speed of the potato at the lowest point of its motion? let g be = 9.80 m/s^2
The speed of the potato at its lowest point of motion which has a mass of 0.260 kg tied to a 2.50 m long rope is 7 m/s.
Law of conservation of energyBasically, the law of the conservation of energy is one of the laws of Physics which states that energy is eternal, so it can't change all the time, and has the same value both before something happens and after it happens. Well, the existence of this energy can also be changed in form with a magnitude that will always be the same. In this law of conservation of energy, the energy in question is kinetic energy, potential energy, mechanical energy, and others.
So, the kinetic energy of that potato will be equal to its potential energy when the string is pulled and the potato will be released.
The equation:
KE = PE
So, the speed of the potato at its lowest point of motion which has a mass of 0.260 kg tied to a 2.50 m long rope is:
(½) (m) (v²) = (m) (g) (h)
(½) (0.26) v² = (0.26) (9.8) ((2.5)
0.13 v² = 6.37
v² = 49
v = [tex]\sqrt{49}[/tex]
= 7 m/s
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a string trimmer is a tool for cutting grass and weeds; it utilizes a length of nylon "string" that rotates about an axis perpendicular to one end of the string. the string rotates at an angular speed of 47 rev/s, and its tip has a tangential speed of 54 m/s. what is the length of the rotating string?
The length of rotating string having 47 revolutions is 2m.
A string trimmer is a tool for cutting grass and weeds; it makes use of a length of nylon "string" that rotates around an axis perpendicular to one end of the string. The string's tangential speed at its tip is 54 m/s, and its angular speed is 47 rev/s.
[tex]Z=dc+CvdT+\pi (d^2L)/dT^2+\alpha \\\\Z=dc+CvdT\\\\Z=\left \{ {{\neq 1} \atop {=1}} \right.[/tex]
For ideal situations Z needs to be unity.
Mathematically, function tends to reduce to negligible.
This is due to its inverse relation with order of the derivative.
[tex]Cv\geq 1[/tex]
The linear speed of any object moving along a circular path at any given moment is known as tangential speed or tangential velocity. For any two instants of time for a given object in circular motion, the direction of tangential speed can never be the same.
[tex]\frac{d^2L}{y}+S=0\\ \\\frac{d^2L}{y}=0\\\\s\neq 0[/tex]
[tex]speed= \frac{47\pi }{54}\\ \\=12.38m/s[/tex]
Length of string=12.38 /2π
=1.97m approx to 2m
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at what rate will a pendulum clock run on the moon, where the acceleration due to gravity is 1.631.63 m/s2, if it keeps time accurately on earth? that is, find the time (in hours) it takes the clock's minute hand to make one revolution on the moon.
The time it takes the clock's minute hand to make one revolution on the moon is (1.631.63/9.8)^2 * 60 minutes, or roughly 1.4 hours.
What is revolution?
When the populace rebels against the government, usually because of perceived oppression (ideological, social, or economic), or political incompetence, a revolution is defined in political science as a fundamental and comparatively unexpected change in political politics and influence organisation.
The period of a pendulum is determined by the equation T = 2π√(L/g), where T is the time it takes for the pendulum to make one complete oscillation, L is the length of the pendulum, and g is the acceleration due to gravity. Thus, on the moon, the period of the pendulum is T = 2π√(L/1.631.63 m/s2).
On Earth, the period of a pendulum is T = 2π√(L/9.8 m/s2). Thus, the ratio between the period on the moon and the period on Earth is T_moon/T_Earth = (2π√(L/1.631.63 m/s2))/(2π√(L/9.8 m/s2)) = sqrt(1.631.63/9.8).
Since the period of the pendulum is related to the time it takes for the clock's minute hand to make one revolution, the ratio between the time it takes the clock's minute hand to make one revolution on the moon and the time it takes the clock's minute hand to make one revolution on Earth is (T_moon/T_Earth)^2 = (1.631.63/9.8)^2.
Therefore, the time it takes the clock's minute hand to make one revolution on the moon is (1.631.63/9.8)^2 * 60 minutes, or roughly 1.4 hours.
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according to einstein’s second postulate, if you are moving 10.0 m/s on a bike with headlight on, what is the speed of the light from the bike?
The light from the bicycle have a velocity of 3.00x 10^8 m/s.
Explain Einstein's two postulates.
Einstein's two postulates form the foundation of modern relativity. The idea that the rules of physics are the same and can be expressed in their most basic form in all inertial frames of reference is the first postulate of special relativity. The assumption that the speed of light, or c, is a constant regardless of the source's relative motion is known as the second postulate of special relativity.
How several observers see the same event is the subject of relativity.
The theory of special relativity states that, in an inertial frame of reference, an object's velocity is relative to the frame from which it is observed or measured.
A body in motion moves in a straight path at a constant speed unless acted upon by an outside force in an inertial frame of reference, and a body at rest remains at rest.
According to einstein’s second postulate, speed of light from bike is equal to normal normal speed of light i.e. 3*10^8m/s
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what is the net force on the block at this time 0.89 s? (a negative force is to the left; a positive force is to the right)
The net force on the block at 0.89 s is zero Newtons.
What is net force?
The vector sum of the forces that act on a particle as well as object is known as the net force in mechanics. The original forces' impact on the motion of the particle is replaced by the net force, which is a single force. In accordance with Newton's second law of motion, it causes the particle to accelerate at a rate equal to the sum of all those actual forces. In order to keep the object's jets moving underneath the original system of forces, it is possible to calculate the torque connected to the point of application of the a net force. As with all actual forces combined, its corresponding torque, or net force, is becoming the resultant force and affects the object's rotational motion.
This is because the two forces acting on the block (the 10 Newton force to the right and the 10 Newton force to the left) are equal in magnitude, thus canceling each other out. Therefore, the net force on the block is zero Newtons.
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a ferris wheel starts from rest and builds up to a final angular speed of 1.9 rad/s while rotating through an angular displacement of 4.9 rad. what is its average angular acceleration?
The average angular acceleration of a Ferris wheel with final angular speed 1.9 rad/s and angular displacement 4.9 rad is 0.37 radians per square second.
What is angular displacement ?
The angle at which a point revolves around a particular axis or centre defines the angular displacement of a body. Because a body rotates about its axis, its motion cannot simply be analysed as a particle because it is constantly altering its speed and acceleration.
According to the given information
Angular speed = 1.9 rad/s
Angular displacement= 4.9 rad
Let the Ferris wheel accelerates at constant rate,then
[tex]w^{2} = w{o} ^2 + 2.\alpha .[/tex] (θ - θo)
given that
[tex]w_{0 }[/tex] = 0 rad/s
[tex]w[/tex] = 1,.9 rad/s
θ - θo = 4.9 rad
α = [tex](1.9 rad/s)^{2} - (0 rad/s)^{2} / 2. (4.9 rad )[/tex]
α = 0.37 [tex]rad/s^{2}[/tex]
The time needed to accelerate the Ferris wheel uniformly is given by-
[tex]w = w_{0} + \alpha .t[/tex]
t = [tex]1.9 - 0 / 0.37[/tex]
t = 5.13 sec
now average angular velocity = [tex]\frac{w - w_{0} }{t}[/tex]
[tex]\alpha _{avg}[/tex] = 1.9- 0/ 5.13
= 0.37 [tex]rad/s^{2}[/tex]
The average angular acceleration of the ferris wheel is = 0.37 [tex]rad/s^{2}[/tex].
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use information provided in the animation to help you think about what the data show. which statement must be true about the atmospheres on these three planets?
It is likely critical to understanding the surface temperatures of each planet to understand the overall amount of gases that compose its atmosphere.
What are planets ?
Large natural objects called planets orbit or move around stars. The Sun is a star that is orbited by eight planets. These planets are Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, starting with those that are nearest to the Sun.
Although there are obvious similarities between the atmospheres of the four terrestrial planets and the four gas giant planets, each of the planets has a unique atmosphere. The two main ones are size and separation from the Sun. Small planets and moons like Mars and the Moon have thin atmospheres because gravity helps planets and moons retain their atmospheres.
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Sam is racing her soapbox racer on a straight downhill track. Suppose that the track is 1000 feet long and her distance down the track in feet is given by the function S (t) = t 2 + 30t, where t is in seconds. Assume that S ′(t) = 2t + 30. Sam is trying to break the soapbox racer speed record of 65 feet per second. Does she do it as she races down the 1000 foot track?
Yes, she breaks the record.
Given
distance of track = 1000 feet = 304.8 m
S(t) = t² + 30t
After differentiating we get,
S'(t) = 2t + 30
S''(t) = 2
The time taken by racer = 65 feet per second.
Time taken to for 1000 feet,
1000/65 = 15 second.
Time taken by Sam = S''(t) = 2 by which we can know that the time taken by Sam is less than that of the racer.
Therefore, with differentiating equation, she can surpass the racer and break the record.
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calculate the pressure due to the ocean, in atmospheres, at the bottom of this trench. given that its depth is 11.0 km and assuming the density of seawater is a constant 1.025 x 103 kg/m? all the way down
Let's first create our working equation. Everyone is aware that pressure is a force applied to a specific area of space. That would be P = F/A in an equation. According to Newton's Second Law of Motion, force equals mass times gravity, or F = mg. So, we can change the first equation to read P = mg/A by substituting F.
Now, the force that a fluid applies to a surface may also be used to calculate pressure. The volume of this fluid can be calculated. The density parameter, p = m/V, is used to relate volume and mass. Volume is the product of the cross-sectional area and the height, to further simplify things in terms of height. So, V = A*h. Following that, the working equation will be derived to be
P = pgh
The pressure that a fluid exerts over a specified height is referred to as hydrostatic pressure. We then locate the density of seawater data from the literature. According to research, saltwater has a density between 1,020 and 1,030 kg/m3. Let's stick with 1.020 kg/m3. Making the units consistent while substituting the values:
P = (1,020 kg/m³) (9.81 m/s2)(11 km)*(1,000 m/1km)
P = 110,068,200 Pa or 110.07 MPa
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a sample of an ideal monatomic gas is confined in a rigid 0.008 m3 container. if 40 joules of heat energy were added to the sample, how much would the pressure increase? 5 pa 320 pa 1,600 pa 3,333 pa 5000 pa
If a sample of an ideal monatomic gas is confined in a rigid 0.008 m3 container. if 40 joules of heat energy were added to the sample, how much would the pressure increase by 3,333 Pa only.
Correct option is (D) i.e., 3,333 Pa
At constant volume
∆U = Q = 3/2nR∆T
where in an isochoric process
nR∆T = ∆pV
so Q = 3/2 ∆pV
or
∆p = 2 × +40J/3 × 0.008 m3.
"monatomic" is a combination of the words "mono" and "atomic", and means "single atom". It is usually applied to gases: a monatomic gas is a gas in which atoms are not bound to each other.
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the drawing shows three ac circuits: one contains a resistor, one a capacitor, and one an inductor. the frequency of each ac generator is reduced to one-half its initial value. which circuit experiences the greatest increase in current?
The circuit containing the inductor experiences the greatest increase in current.
What is an inductor?A passive electrical component known as an inductor stores energy as a magnetic field. An inductor is basically just a coil or loop of wire. The number of turns in the coil directly relates to the inductance. The radius of the coil and the kind of material it is looped around both affect inductance.
An inductor is distinguished by its unique inductance, which is defined as the ratio of voltage to current change rate. The magnetic field that is induced on the coil causes inductance.
What are inductors used for?The following are the main uses of inductors in electrical power and electronic equipment: In electrical circuits, choking, blocking, attenuating, or smoothing out high frequency noise are all possible solutions. using power converters to store and move energy (dc-dc or ac-dc).
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the air pollutant that computer simulations would likely show as being the most reduced by the installation of baghouse filters in exhaust systems
The installation of baghouse filters in exhaust systems is Particulate matter.
What is an exhaust system?The exhaust system gathers the cylinder exhaust gases, filters out dangerous materials, lowers the noise level, and then releases the cleaned exhaust gases to an appropriate location of the vehicle away from the occupants. Depending on the engine, the exhaust system may have one or two channels.
What role does the exhaust system play?The majority of people are aware that an exhaust system eliminates the dangerous gases your engine produces, however exhaust systems also perform a lot more functions! The four primary purposes of your vehicle's exhaust system are to reduce fuel consumption, move gases away, reduce noise, and increase engine performance.
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Two blocks are sliding toward one another along a level horizontal surface. One block is moving due east, and the other block is moving due west. The two blocks collide. Which of the following is NOT a possible set of directions the two blocks could be traveling after the collision?
a. Both blocks are traveling east after the collision.
b. Both blocks are traveling west after the collision.
c. One block travels northeast, and the other block travels northwest.
d. One block travels southwest, and the other block travels northeast.
e. One block travels southeast, and the other block travels northwest.
A block moving due east collide with a block moving due west. The set of directions that is not possible after the collision is (c) One block travels northeast, and the other block travels northwest.
This problem can be solved using the law of conservation of momentum, which states the total momentums before and after collision of two objects are the same. Mathematically,
m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂
Where:
m = mass
u = initial velocity
v = final velocity
In the given problem, one block is moving due east, and the other block is moving due west. Hence, before the collision, both objects only have velocity in horizontal components and no vertical components. Therefore, after the collision, the resultant of the velocity should also have only the horizontal component.
a. Both blocks are travelling east after the collision <---- it is possible since both objects only have horizontal component
b. Both blocks are traveling west after the collision.<---- it is possible since both objects only have horizontal component
c. One block travels northeast, and the other block travels northwest. In this case, the components of northeast velocity is due north and due east, while the components of northwest velocity is due north and due west. The resultant of velocity will have vertical (north) component, hence this set of direction is not possible.
d. One block travels southwest, and the other block travels northeast. This is possible, since the north component can be cancelled out by the south component, resulting in horizontal component only.
e. One block travels southeast, and the other block travels northwest.
This is possible, since the north component can be cancelled out by the south component, resulting in horizontal component only.
Therefore, the set of directions that is not possible is (c) One block travels northeast, and the other block travels northwest.
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suppose a 2d system has a stable equilibrium point that is located somewhere outside a limit cycle. can a trajectory starting inside the limit cycle reach this point? justify your answer
If a 2d system has a stable equilibrium point that is located somewhere outside a limit cycle, a trajectory starting inside the limit cycle will not reach the equilibrium point.
A trajectory starting inside a limit cycle will at some point reach the limit cycle. But, even t = ∞, the trajectory will still be in the limit cycle. For the trajectory, there is no possible way to leave the limit cycle. So if a stable equilibrium point is located outside a limit cycle, a trajectory starting inside the limit cycle cannot reach that point.
In mathematics, in the study of dynamical systems with two-dimensional phase space, a limit cycle is a closed trajectory in phase space having the property that at least one other trajectory spirals into it either as time approaches infinity or as time approaches negative infinity.
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a 64 kg person rides in an elevator. if the elevator has a downward acceleration of 3.0 , what is the magnitude of the force of the person on the elevator floor?
The magnitude of the force of the person on the elevator floor is 435.2 N.
What is the magnitude of the force of the person?
The magnitude of the force of the person on the elevator floor is calculated by applying Newton's second law of motion as shown below.
F(net) = ma
where;
F(net) is the net force on the personm is the mass of the persona is the acceleration of the personFor downward motion in an elevator, the force acting on the elevator's floor is given as;
F = mg - ma
F = m(g - a)
where;
m is the mass of the persong is acceleration due to gravity = 9.8 m/s²a is the acceleration of the personF = 64 (9.8 - 3)
F = 435.2 N
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what is the magnitude of the net electric field at the origin produced by this distribution of charge? express your answer in terms of the variables q , a , and constant k .
The magnitude of the net electric field at the origin is kq/a².
What is magnitude?
The magnitude as well as size of a statistical model determines whether it is bigger or smaller than some other objects of the same type in mathematics. Formally speaking, the magnitude of an object is the result of the group of objects it belongs to being ordered (or ranked) and displayed. Magnitude in physics can be interpreted as either a quantity or a distance.
The magnitude of the net electric field at the origin produced by this distribution of charge is given by the equation E = kq/a², where k is a constant, q is the charge, and a is the distance between the origin and the charge. Thus, the magnitude of the net electric field at the origin is kq/a².
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a blue sphere and a red sphere with the same diameter are released from rest at the top of a ramp. the red sphere takes a longer time to reach the bottom of the ramp. the spheres are then rolled off a horizontal table at the same time with the same speed and fall freely to the floor. which sphere reaches the floor first? responses the red sphere the red sphere the blue sphere the blue sphere the sphere with the greater mass the sphere with the greater mass neither; the spheres reach the floor at the same time.
Neither, the spheres reach the floor at the same time.
Why does mass not matter during freefall?
After a period of time spent in free fall, the object will achieve terminal velocity, at which point the force propelling it through the atmosphere towards the ground will be equal to the air friction, which grows with speed. Given that both objects accelerate in the same manner (assuming equal forms), we can infer that the heavier object's terminal velocity will be higher than that of a lighter object because it must reach a higher speed for the air friction to catch up with the heavier weight (G) (same shape). The heavier object will still strike the ground first if there is enough time because it will accelerate for a longer period of time and maintain a higher speed.
Hence, the answer is, Neither, the spheres reach the floor at the same time.
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which of the following provides evidence that a warming planet is related to human behavior (select all that apply; there are one to four possible correct answers)? scientists showing that increasing levels of carbon dioxide cannot impact our climate scientific research showing that temperatures have risen along with carbon dioxide emissions from the nineteenth century scientists agreeing that the earth can only sustain an atmospheric concentration of carbon of about 39,000 parts per million scientific discoveries that burning coal changes the climate by increasing the levels of carbon in the atmosphere
Discoveries that burning coal changes the climate by increasing the levels of carbon in the atmosphere provide evidence that a warming planet is related to human behavior, which causes global warming.
What is Global Warming?
The heating of the earth's surface is due to an increase in carbon content and another pollutant in the atmosphere that, traps the heat being radiated back by the earth's surface, which in turn increases the temperature.
What are pollutants?
Pollutants are a substance that increases the toxicity of something, such as air, water, land, etc., and thus contributes to pollution.
what is pollution?
Pollution is the contamination of the environment by toxic substances, such as nitrogen oxide, carbon monoxide, Ground level ozone, etc. that increase the toxicity of the environment and are hazardous for living organisms.
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the evil team of ms. moonstruck and mr. luny intend to deflect the moon from its orbit around earth by pulling it with a force of 3530 n . they plan to accomplish this by placing a mini black hole 7.33×106 m from the center of the moon and letting gravitation do what gravitation does. what must the mass of the mini black hole be for the evil duo's evil scheme to succeed? the mass of the moon is 7.36×1022 kg .
In order for the wicked duo's plot to work, a small black hole with a mass of 38634.83 kg must exist.
How does science define force?Science has a specific definition for the term "force." At this point, describing a force as being pushed or pulled is quite acceptable. A strength is not something that something "contains" or "has in it." A force is applied to one thing by another. The idea of such a force encompasses either living and non-living things.
Briefing:To overcome this issue, you should be aware of Isaac Newton discovered an equation that expresses the gravitational effect of two mass-bearing things at a distance r. The formula is as follows:
where,
G = It is the universal gravitational constant = 6.67 x 10⁻¹¹ Nm²/kg²
m₁ = mass of the moon=7.36 × 10²² kg
m₂ = mass of the mini black hole
r = distance=7.33 × 10⁶ m
F = force=3530N
solving for m;
(F)(r²)/m₁(G) = m₂
3530*[(7.33 × 10⁶)²]/(7.36 × 10²²) (6.67 x 10⁻¹¹) = m₂
m₂ = 38634.83 kg
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A friend asks you how much pressure is in your car tires. You know that the tire manufacturer recommends 30 psi, but it’s been a while since you’ve checked. You can’t find a tire gauge in the car, but you just finished taking physics and so you tell your friend, "I don’t know, but I can figure it out." From the owner’s manual you find that the car’s mass is 1700 kg . It It seems reasonable to assume that each tire supports one-fourth of the weight. Using a ruler, you find that the tires are 16 cm wide and the flattened bottom segment of the tire is 15 cm long. Your observation of the tire tread pattern suggests that two-thirds of this segment is in actual contact with the road.What answer—in psi—will you give your friend?
Each tire is under 27 psi pound of pressure.
The weight is defined by the product of the mass and acceleration due to gravity, and is given by the following relation:
w=mg
Here, w is the weight, m is the mass, and g is the acceleration due to gravity.
The pressure is defined by the ration of force and the area of the surface, and is given by the following relation:
P=F/A
Here, P is the pressure, F is the force, and A is the area
Pressure on the tires is calculated from force acting on each tire to the area of each tire. Each tire supports one-fourth of the weight.
Here, the weight is the force
The force due to gravity is equal to the weight.
The force due to gravity of the car is,
[tex]F_g[/tex]=mg
Substitute 1500 kg for m and 9.8 m/[tex]s^2[/tex] for in the equation [tex]F_g[/tex]=mg .
[tex]F_g[/tex]= 1500 kg ×9.8 m/[tex]s^2[/tex]
=15000 N
The force due to gravity acting on each tire is,
[tex]F_e=F_8/4[/tex]
Substitute 15000 N for [tex]F_g[/tex] in the equation
[tex]F_g=15000/4[/tex]
=3750 N
Substitute 3750 N for F and 195×1[tex]0^-^4[/tex] [tex]m^2[/tex] for in the equation .
P=192307.6 Pa(0.000145038 psi/1pa)
=27.8 psi
As a result, each tire is under 27.8 psi pound of pressure.
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Object A and object B are both heated to 200 Celsius. Object A must absorb 4,000J of heat energy to reach a temperature of 200 Celsius, while object B must absorb 2,500J of heat energy to reach a temperature of 200 Celsius. Which object has the highest specific heat ?
The specific heat capacity is like having capacity to acquire or absorb heat. Because of this, object A will have higher specific heat capacity than object B
What is Specific Heat Capacity ?The specific heat capacity of a substance is the quantity of heat required to raise the temperature of unit mass of the substance by one kelvin.
Given that Object A and object B are both heated to 200 Celsius. Object A must absorb 4,000J of heat energy to reach a temperature of 200 Celsius, while object B must absorb 2,500J of heat energy to reach a temperature of 200 Celsius.
Since both are heated to the same temperature, that mean object A has large heat capacity to absorb 4,000J of heat energy to reach a temperature of 200 Celsius. While object B has a less heat capacity to absorb 2,500J of heat energy to reach a temperature of 200 Celsius.
Therefore, object A has the higher specific heat capacity than object B
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mass of blood. the human body typically contains 5.1 l of blood of density 1060 kg/m3 . how many kilograms of blood are in the body?
If the human body typically contains 5.1 L of blood of density 1060 kg/m³, there are 5 kilograms 406 ounce of blood in the body.
The density of blood plаsmа is аpproximаtely 1025 kg/m³ аnd the density of blood cells circulаting in the blood is аpproximаtely 1125 kg/m³. Blood plаsmа аnd its contents are known аs whole blood. The аverаge density of whole blood for а humаn is аbout 1060 kg/m³.
e = 1.060 kg/liter ⇒ change to m³
e = 1.060 × [tex]10^{-3}[/tex]
Blood is in the body (m):
m = e × v
m = 1.060 × 5.1 × [tex]10^{-3}[/tex]
m = 5.406 × [tex]10^{-3}[/tex] kg
m = 5 kg 406 ounce
The аverаge density of whole blood for а humаn is 1.060 kg/liter. So, 5.1 liters of аverаge blood will weigh 5 kg 406 ounce.
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The diagram represents a closed energy system consisting of air and equal masses of copper, granite, and water in a perfectly insulated container. The temperatures were taken at the time the materials were placed inside the closed system.
Q1. In the first day after the materials were placed in the system, the temperature of the water would probably ___.
Q2. As time passes, the total energy in the system will _________.
(1) In the first day after the materials were placed in the system, the temperature of the water would probably increase.
(2) As time passes, the total energy in the system will be conserved.
What is law of conservation of energy?
The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.
Based on the law of conservation of energy, when equal masses of copper, granite, air and water are in a perfectly insulated container, there will be heat transfer from one object to another.
After several hours, all the objects in the perfectly insulated container, will attain equilibrium temperature.
The equilibrium temperature attained by the objects will be greater than the initial temperature of water, lower than the initial temperature of copper, granite, and air.
Conclusively, we would say that the temperature of water will increase in the first day after the materials were placed in the system.
As time passes, the total energy in the system will be conserved since it is a perfectly insulated container, and no heat energy will be lost.
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