47.4 mm hg is the pressure at 830 km/h at the same altitude
Bernoulli's principle refers to this inverse relationship between pressure and speed at a particular point in a fluid. Principle of Bernoulli
P1=12 mm hg
v1=210 km/h
v2=830 km/h
p2=?
P1/V1=P2/V2
P2=P1V2/V1
P2=12×830÷210
P2=47.4 mm hg
The definition of pressure is force/area. Divide the weight of the snow by the surface area of the roof to show the pressure that snow puts on it. In physics, gases are a common source of pressure. The lack of pressure is referred to as a "vacuum". Since "nature abhors a vacuum," people have long believed that vacuums are improbably uncommon and unnatural. This is not actually the case.
The quantity of pressure units is absurd. The torr or mmHg units are frequently used. The height of a mercury column is the only topic of discussion. There are 760 torr, or mmHg, in the atmosphere. You might also take a look at mmH2O, which employs a related concept.
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The average kinetic energy of gas molecules is ________ proportional to the absolute temperature.
The absolute temperature of the gas determines the average kinetic energy of the gas particles, and all gases with the same temperature have had the same average kinetic energy.
What exactly is kinetic energy?A sort of energy that such an item or particle possesses as a result of its mobility is known as kinetic energy. An item accelerates and gains kinetic energy when work, which transfers the heat, is done on it by exerting a net force.
What makes kinetic energy so special?Thermal energy also goes by the term of heat energy. It is kinetic because the atoms and molecules in the thing are constantly moving. The temperature of an object can be transferred to another object by means of the atoms and molecules that are in motion.
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A baseball player pitches a 0.14-kg baseball at 30 m/s.
–Calculate the kinetic energy for the baseball.
–How much work did the player do on the ball to give it this energy?
The kinetic energy of the baseball be 63 joule.
The player had to work of 63 joule on the ball to give it this energy.
What is kinetic energy?According to the definition of kinetic energy in physics, it is the amount of work that an item may accomplish while in motion.
As a scalar quantity, kinetic energy can only be fully defined by its magnitude.
Given that:
Mass of the baseball: m = 0.14 kg.
Speed of the baseball: v = 30 m/s.
So, kinetic energy of the baseball= 1/2×0.14×30² joule = 63 joule.
Hence, the player had to work of 63 joule on the ball to give it this energy.
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a simple harmonic oscillator with an amplitude of 2.0\;\mathrm{cm}2.0cm passes through its equilibrium position once every 0.0300.030 seconds, what is the frequency of the oscillator?
The frequency of the oscillator is 33.33 Hz.
What is the frequency of the oscillator?
Frequency describes the number of waves that pass a fixed place in a given amount of time
The frequency of the oscillator is determined from the number of times or period taken for the wave to make one complete cycle.
Mathematically, the formula for frequency of oscillatory motion is given as;
F = 1/T
where;
F is the frequency of the oscillatorT is the period of the oscillationF = (1) / (0.03 s)
F = 33.33 Hz
Thus, the frequency of the oscillator is a function of the period of the motion.
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if the number of sulfate aerosols inside a cloud should increase, the cloud would have to share its available moisture with the added nuclei, and cloud droplets would be produced.
According to collision- coalescence proposition, conformation of droplet from pall clouds occurs when pall clouds collide and coalesce or stick together.
The only significant difference between a droplet and a pall drop is that a droplet correspond of a haste that's non-negligible during the fall.
Larger driblets having advanced terminal rapidity fall briskly and collide with lower clouds. frequently the pall driblets stick together and coalesce to form a larger drop.
This starts a chain response where these bigger driblets fall indeed fleetly, collide with the other clouds in their path and combine with these driblets.
As drop and ice demitasse size increase, the probability increases that the clouds will burst in the pall. This is the medium behind rush. When the shadows come heavy enough due to these clouds or ice chargers, rain or snow is produced that falls to the ground.
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An object moving in a straight line has a velocity v in meters per second that varies with time t in seconds according to the following function.
v = 4 + 0.5t^2
The instantaneous acceleration of the object at t = 2 seconds is
2 m/s2
The instantaneous acceleration of the object at t = 2 seconds is:
2 m/s2.
In mechanics, acceleration is the charge of change of the velocity of an item with respect to time. Accelerations are vector portions. The orientation of an object's acceleration is given via the orientation of the internet pressure appearing on that object.
Acceleration, charge at which velocity adjustments with time, in terms of both speed and direction. A point or an object moving in a directly line is accelerated if it hastens or slows down.
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Atomic Clock Transition The global standard for time is based on a transition in cesium atoms that occurs when a microwave photon of frequency 9,192,631,770 Hz is absorbed. What is the energy difference in eV between the two levels of cesium that correspond with this transition?
Atomic Clock Transition The global standard for time is based on a transition in cesium atoms that occurs when a microwave photon of frequency 9,192,631,770 Hz is absorbed, then the energy difference between the two levels of cesium that correspond with this transition is 38.06 x 10-¹⁴eV
When Cesium atoms are bombarded with microwaves of a certain frequency, this 55th electron goes from one of these hyperfine energy states to the other but then it comes back to the slightly lower energy state and when it does it emits electromagnetic radiation with the exact frequency of 9,192,631,770 Hertz. The time interval in which this wave completes these many cycles is defined as a second. The second is the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom.
As we know, energy difference is equal to-
∆E = hf
where h = Planck's constant i.e. 6.626x10-³⁴
f = frequency i.e. 9,192,631,770
∆E = (6.626 x 10-³⁴) * (9,192,631,770)
∆E = 60.91 x 10-³³Joule
To convert joule to electron volt (eV)
1eV = 1.6*10-¹⁹J
∆E = 60.91 x 10-³³/1.6 x 10-¹⁹
∆E = 38.06 x 10-¹⁴eV
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Why does the skateboarder continue to move forward when he hits the trash? what is the unbalanced force?.
According to Newton's first law: An item at relaxation will continue to be at relaxation until acted on with the aid of using an unbalanced force.
What are newton's laws of motion?
Newton's laws of motion are three basic laws of classical mechanics that describe the relationship between the motion of an object and the forces acting on it. These laws can be paraphrased as follows: A body remains at rest, or in motion at a constant speed in a straight line, unless acted upon by a force.
According to Newton's first law: An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
There is a force that moves the skater and his skate forward, after the hit, his speed is reduced, but this force is not completely counteracted, and that's why he continues moving forward.
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an applied 25 n force pushes on a 5.0 kg object resting on a frictionless horizontal surface. the force is directed downward at a 20 degree angle
An applied 25 n force pushes on a 5.0 kg object resting on a frictionless horizontal surface. the force is directed downward at a 20 degree angle is 23.49N
X- component = 25cos20° = 23.49 N
All objects with mass or energy are attracted to one another by gravity, which derives from the Latin word for "weight" (gravitas). By far the weakest of the four fundamental interactions, gravity is 1038 times weaker than the strong interaction, 1036 times weaker than the electromagnetic force, and 1029 times weaker than the weak interaction. As a result, it has no discernible impact on the level of subatomic particles. The motion of planets, stars, galaxies, and even light are all governed by gravity, which is the most important interaction between objects at the macroscopic level.
On Earth, gravity lends weight to physical objects, and the Moon's gravity is what causes sublunar tides in the oceans (the analogous antipodal tide is brought on by the Earth's inertia).
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he purpose of low beam headlights is to provide better visibility to a driver driving in fog, rain and smoke. a) true b) false
It is true that the aim of low beam headlamps is to increase a driver's visibility while they are driving in the rain, fog, or smoke.
What brings on fog?When cold air passes over warm water, steam fog is created. The warm moist breath and over lake cools when it comes in contact with the cool air, reaching a humidity level of 100% and forming fog.
How does morning fog develop?Southerly winds bring in warm, moist air, and they will come into contact with any snow or cool wetness on the ground. The fans going in will cool down as a result of this air-ground contact. Dew point then rises, resulting in high humidity and also the formation of fog.
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The complete question is-
The purpose of low beam headlights is to provide better visibility to a driver driving in fog, rain, and smoke.
(a). True
(b). False
for a parallel flow double pipe heat exchanger insulated from its surroundings, the mean outlet temperature of the initially cold fluid can exceed the mean outlet temperature of the initially hot fluid.
Heat flows from the hot fluid to the cold fluid, and the amount of heat transferred is directly dependent on the temperature difference between the two sides.
What is heat exchange?
In a heat exchanger, heat flows from the hot fluid to the cold fluid, and the amount of heat transferred is directly dependent on the temperature difference between the two sides.
In a parallel flow arrangement, the cold inlet and hot inlet are interacting with each other. At that entry point, the temperature difference is wide, and heat transfers quickly.
As the streams pass through the parallel-flow exchanger, they start to approach each other’s temperature. The heat transfer rate drops in line with the reduction in temperature difference.
Now we have the answer to your question. It is impossible for the exit temperature of the cold liquid to exceed the exit temperature of the hot liquid. This is because once the same temperature is reached, all heat transfer stops because there is no temperature difference.
This limitation of parallel flow heat exchangers is the reason most heat exchangers are arranged in counterflow. The counter-flow design results in a higher average temperature difference and greater heat transfer.
Therefore, heat flows from the hot fluid to the cold fluid, and the amount of heat transferred is directly dependent on the temperature difference between the two sides.
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an opaque horizontal plate is well insulated on the edges and the lower surface. the irradiation on the plate is 3000 w/m2, of which 500 w/m2 is reflected. the plate has a uniform temperature of 700 k and has an emissive power of 5000 w/m2. determine the total emissivity and absorptivity of the plate. add: repeat assuming material is semitransparent with transmissivity of 0.10, the same reflectivity and the same emissive power.
Total emmisivity is 0.3706
and absorptivity is 0.833
Irradiation, I = 3000W / m2
reflection, Ir = 500W / m2
uniform temperature, T = 700 k
emissive power E = 5045 W / m2
Total emmisivity,
e = E / 5.67 x 10^-8 (T^4)
e= 5045 / 5.67 x 10^-8 x 700^4
e= 0.3706
absorptivity,
∝ = Iabs / I = I -Ir / I
∝ = 3000-500 / 3000
= 1 - 500 / 3000
∝ = 1 - 1/6
∝ = 0.833
Emissivity is described as the ratio of the energy radiated from a material's surface to that radiated from an ideal emitter, referred to as a blackbody, on the identical temperature and wavelength and underneath the equal viewing conditions.
It's miles a dimensionless range among zero (for an excellent reflector) and 1 (for an ideal emitter).
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an object is suspended by a string from the ceiling of an elevator. if the tension in the string is equal to 25 n at an instant when the elevator is accelerating downward at a rate of 2.0 , what is the mass of the suspended object? (your answer should have one decimal place)
The mass of the suspended object is 3.2 kg.
Solution:
25 N - m (9.8 m/s²) = - m (2.0 m/s²)
= m = (25 N) / (9.8 m/s² - 2.0 m/s²) ≈ 3.2 kg
When suspending an object freely from one point and with a stable balance, hang it so that the center of gravity is directly below the mounting point. In this sketch, the object is suspended at point A and its center of gravity G is directly below point A.
Objects can be hung by strings from a fixed point and can be freely hung and balanced. This is either informed in the question statement or previously determined using previous calculations. Mass must be specified in kilograms.
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what transmitter power would be needed for a cellphone to communicate reliably with the cell tower, if the phone is 7.9 kmkm from the tower?
By nation, technology, and urban density, there are vast differences. To connect to the cell tower in a trustworthy manner, use a cellphone.
Uses for transmitters.An object that generates radio waves that radiate from an antenna is referred to as a transmitter in the field of telecommunications. A transmitter is a device used in process control that transforms a sensor's output signal into a signal that can be used to measure and regulate a process variable.
What do receiver and transmitter mean?All electrical gadgets, including mobile phones, television stations, ships, etc., require a transmitter as a basic component. In addition, they are utilized for navigation. A receiver is an electrical gadget that picks up radio waves and messages that the transmitter transmits.
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for what scattering angle (in degrees) will the wavelength shift of x-rays be exactly double that found in part (a)?
The wavelength shift of x-rays be exactly double that found in part (a), if the scattering angle is 84.26°
Δλ = h ( 1 - cos θ ) / me c
Δλ = Wavelength shift
h = Planck's constant
θ = Scattering angle
me = Mass of an electron
c = Speed of light
h = 6.626 * 10⁻³⁴ J s
me = 9.1 * 10⁻³¹ kg
c = 3 * 10⁸ m / s
Δλ' = 6.9 * 10⁻¹⁴ m
Δλ = 2 Δλ'
Δλ = 2 * 6.9 * 10⁻¹⁴
Δλ = 13.8 * 10⁻¹⁴ m
13.8 * 10⁻¹⁴ = 6.626 * 10⁻³⁴ ( 1 - cos θ ) / 9.1 * 10⁻³¹ * 3 * 10⁸
13.8 * 10⁻¹⁴ = 0.2427 * 10⁻¹¹ ( 1 - cos θ )
1 - cos θ = 56.86 * 10⁻³
cos θ = 56.859 * 10⁻³
θ = 84.26°
The given question is incomplete. The complete question is:
for what scattering angle (in degrees) will the wavelength shift of x-rays be exactly double that found in part (a) which is 6.9 * 10⁻¹⁴ m.
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A 0. 200-kg mass attached to the end of a spring causes it to stretch 5. 0 cm. If another 0. 200-kg mass is added to the spring, the potential energy of the spring will be.
The potential energy of the spring will be 4 times as much.
What is potential energy?
Potential energy is a form of stored energy that is dependent on the relationship between different system components. When a spring is squeezed or extended, its potential energy increases. If a steel ball is lifted above the ground as opposed to falling to the ground, it has higher potential energy.
In the first question, we have to caculate the constant of the spring with this equation:
[tex]$$m * g=k * x$$[/tex]
Getting the k :
[tex]k=\frac{m * g}{x}=\frac{0,2[k g] * 9,81\left[\frac{m}{*^2}\right]}{0,05[\mathrm{~m}]}=39,24\left[\frac{N}{m}\right]$$[/tex]
Then we can calculate how much the spring stretch whith the another mass of [tex]$0,2 \mathrm{~kg}$[/tex] :
[tex]x=\frac{m * g}{k}=\frac{0,4[k g] * g, 81\left[\frac{m}{a^2}\right]}{39,24\left[\frac{N}{m}\right]}=0,1[m]$$[/tex]
The energy of a spring:
[tex]E=\frac{1}{2} * k * x^2$$[/tex]
For the first case:
[tex]E=\frac{1}{2} * 39,24\left[\frac{N}{m}\right] *(0,05[m])^2=0,049[J]$$[/tex]
For the second case:
[tex]E=\frac{1}{2} * 39,24\left[\frac{N}{m}\right] *(0,1[m])^2=0,0196[J]$$[/tex]
If you take the relation [tex]$\mathrm{E} 2 / \mathrm{E} 1=4$[/tex].
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calculate the energy and wavelength of the characteristic x-ray produced when a k-shell electron is replaced by an m-shell electron in tungsten.
The electron in tungsten's energy is 66 eV and wavelength is 1.89 x 10⁻¹¹m.
What is energy and wavelength of electron?The wavelength of any wave is the distance between one crest and the next. The wavelength is commonly represented by the symbol.The amount of energy is proportional to the electromagnetic frequency of the photon and thus inversely proportional to the wavelength. The higher the frequency of a photon, the greater its energy. The longer the wavelength of a photon, the lower its energy.The mean energy of the energy spectrum is a critical parameter for therapeutic electron beam dosimetry. It is frequently assumed that the mean energy of such beams remains constant across the beam and that only its degradation with depth is taken into account.To learn more about wavelength refer to :
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Why does the closed top of a convertible bulge when the car is riding along a highway?.
Inside the automobile, the air pressure is higher than outside.
What is air pressure?Everything you touch is pressed upon by the weighty air that surrounds you. This pressure is referred to as air pressure or atmospheric pressure. It is the force that the air above a surface applies to it while gravity pulls the surface toward Earth. A barometer is frequently used to measure atmospheric pressure.
Now
According to Bernoulli's equation, regions of airflow with greater velocities have lower pressure than regions with lower velocities when considering airflow over and around a surface.
The air inside the convertible is moving more quickly than the air outside. As a result, there is a greater pressure zone immediately inside the roof's surface.
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1. Herbivores, who have a diet high in tough plant fibers, tend to have a much longer digestive tract than carnivores. Apply your knowledge of digestion to discuss why you think this is the case.
2. The lower esophageal sphincter forms a barrier to prevent stomach acid and digestive enzymes from entering the esophagus. Apply your knowledge of these compounds to explain why dysfunction of the lower esophageal sphincter would be harmful to the esophagus, pharynx, and mouth.
The majority of nutrients and minerals are absorbed from food by the small intestine, also referred to as the small bowel, which is an organ in the digestive system, Food that has been swallowed cannot pass back up the lower esophagus due to a ring of muscle fibers.
1) Because they consume plant and grass-based meals that are high in cellulose, which takes a while to digest, herbivores have longer small intestines than carnivores. Bile, a digestive fluid released by the liver, is kept in the gallbladder.
2) The lower esophageal sphincter, a ring of muscle fibers, separates the esophagus from the stomach. Heartburn and other gastric disease symptoms can result from food and fluids moving backward into the esophagus if the sphincter does not seal completely (GERD).
Regular overeating and being overweight cause the stomach to enlarge and significantly increase the strain on the LES.
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a 150-g block connected to a light spring for which the force constant is 3.2 n/m oscillates on a frictionless, horizontal surface. the block is displaced 3.0 cm from equilibrium and released from rest as in the figure.
The block will oscillate back and forth along the horizontal surface with a period given by the equation $T = 2\pi\sqrt{\frac{m}{k}}$,
where $m$ is the mass of the block, $k$ is the force constant of the spring, and $T$ is the period of the oscillation. In this case,
the mass of the block is 150 g, which is equivalent to 0.15 kg, and the force constant of the spring is 3.2 N/m.
Plugging these values into the equation, we get
$$T = 2\pi\sqrt{\frac{0.15}{3.2}} \approx 0.3268\text{ s}$$
The amplitude of the oscillation is equal to the maximum displacement of the block from its equilibrium position, which in this case is 3.0 cm. The block will oscillate back and forth with this amplitude and with a period of approximately 0.3268 seconds.
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given 2 spheres. big sphere diameter is 50% more than smaller one. weight of smaller one is 8 kg. what's the weight of the smaller one?
The weight of the larger mass will therefore be 27 kg. When you know the radius, you may use the formula volume = (4/3) r3 to calculate the sphere's volume or mass.
Then, using the formula mass = volume * density, you can calculate the mass by multiplying the volume by the density: mass = volume density. The formula mass = (4/3) r3 density can also be used.
The new radius can be expressed as r + 0.5r = 1.5r if the radius is increased by 50%. As a result, the new volume is 337.5% larger than the original. In other words, the new mass is 337.5% of the old mass.
The new mass will therefore be 27kg.
Furthermore, the area and circumference of the circle grow as the circle's diameter rises.
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Therefore, the greater mass will weigh 27 kg. When you are aware of the radius, you can determine the volume or mass of the sphere using the formula volume = (4/3) r3.
The mass can then be determined by multiplying the volume by the density using the formula mass = volume*density. It is also possible to apply the formula mass = (4/3)r3 density.
If the radius is expanded by 50%, the new radius may be written as r + 0.5r = 1.5r. The new volume is therefore 337.5% bigger than the old one. The new mass is therefore 337.5% of the original mass.
Therefore, the new mass will be 27kg.
Furthermore, as the circle's diameter increases, so do its surface area and circumference.
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how long ago (in seconds) was that galaxy right next door to our own galaxy if it has always been receding at its present rate? since the universe began when all galaxies were very close together, this number is a rough estimate for the age of the universe.
According to the Statement it always was receding at its current rate, that galaxy was just next to our own galaxy, moving at 8000 km/s.
Which galaxy contains Earth?Astronomy The Universe The Nebula Galaxy. Did you know that, in conjunction to our light, the Sun, the Milky Way Cluster, a large expanse of space, includes millions and billions of other stars? Its Milky Way is distinguished by a phenomenal number of stars, infinitesimal particles, and gas.
Briefing :Since V = H x d, the velocity of a galaxy at a distance of 400 x 10⁶ light-years = 8000 km/s
For H = 20 km/s per million light-years. The time required to travel
4 x 10⁸ light - years at 8000 km/s is given by :
T = (4x10⁸ light - years ) (9.46 x 10¹² km /light-year) ÷ 8 x 10³
= 4.7 x 10¹⁷ = 15 billion year
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Complete question : Consider a galaxy at a distance of 400 million light-years receding from us at a velocity, v. If the Hubble constant is 20 km/s per million light-years, what is its velocity? How long ago was that galaxy right next door to our own Galaxy if it has always been receding at its present rate?
. In the figure, charge q₁ = 3.1 x 10-6 C is placed at the origin and charge q2 = -8.7 x 10-6 C is placed on the x-axis, at x = -0.2 m. Where along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero?
0.296 m along the x-axis can a third charge Q = -8.3 µC be placed such that the resultant force on this third charge is zero.
What is charge?Electric charge is a characteristic shared by many basic, or subatomic, particles of matter. For instance, protons have a positive charge and electrons have a negative charge, and neutrons have no charge.
Given that,
q₁ = 3.1 x 10⁻⁶ C
q₂ = - 8.7 x 10⁻⁶ C
x = - 0.2 m
Q = - 8.3 µC
Let, the charge is kept at r.
The force due to first charge:
F₁ = k × q₁ × Q / r²
The force due to second charge:
F₂ = k × q₂ × Q / (r -x)²
The net force acting on the third charge is zero.
F₁ + F₂ = 0
k × q₁ × Q / r² = k × q₂ × Q / (r -x)²
Hence, the position of charge on x-axis:
r = x / ( 1 - [tex]\sqrt{q_2 /q_1}[/tex])
r = -0.20 m / (1 - [tex]\sqrt{(8.6 *10^-6 /3.1 *10^-6}[/tex])
r = 0.296 m
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A car is sitting at a traffic light. When the light turns green, the car begins moving, accelerating at a constant rate. After 14.9 seconds the car has moved 266 meters. What is the acceleration of the car?
Answer:
The acceleration 2.4 m/s²
Explanation:
Given:
V₀ = 0 m/s - Initial vehicle speed
t = 14.9 s - Time
D = 266 m - Distance traveled by car
__________
a - ? - the acceleration
D = V₀·t + a·t² / 2;
V₀ = 0
D = a·t² / 2;
a = 2·D / t² = 2·266 / 14.9² ≈ 2.4 m/s²
from the third rule you know that if a rope passes over a pulley, the tension in the rope is unaffected. with this observation in mind, what is the magnitude of the tension in the second rope?add the forces acting on the block to find the magnitude, t2 , of the tension in rope 2. express your answer in terms of some or all of the variables f , mb and g .
According to the third rule, a rope's tension remains unaffected if it passes over a pulley. The second rope's second rope's tension in magnitude is W strong (weight of the block).
A force throughout a medium's length is known as tension, particularly a force carried by a flexible medium like a rope or cable. An action-reaction pair of forces acting at each end of the mentioned elements is what is referred to as tension. The greatest size and direction of an object are referred to as its magnitude. Both vector and scalar values use magnitude as a common factor. We know that scalar quantities are those that have magnitude and nothing else by definition.
Whenever a system is in equilibrium,
T1 = F
T1 = mb*G+T2
T2 = F - MG
0R
T2 = W(weight of the block)
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a refrigerator is an example of a . a refrigerator is an example of a . hot reservoir heat engine cold reservoir reversible process heat pump
A refrigerator is an example of a: Heat Pump
What is second law of thermodynamics?
According to Clausius' statement on the second law of thermodynamics, it is impossible to build a system that operates in a cyclical process, in which heat moves from areas of lower temperature to areas of higher temperature without working on it.
This statement applies to systems that transfer heat from a cold reservoir to a hot reservoir. Refrigerators and heat pumps do the same thing.
Refrigerators give off heat from the freezer to the atmosphere (exhaust air at the back of the refrigerator) even though the temperature inside the freezer is always lower than the temperature of the atmosphere.
Similarly, a heat pump transfers heat from a room to the outside air, cooling the room, which is cooler than the outside air.
A refrigerator is an example of a: Heat Pump
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During its final days as a red giant, the Sun will reach a peak luminosity of about 3000LSun. Earth will therefore absorb about 3,000 times as much solar energy as it does now, and it will need to radiate 3,000 times as much thermal energy to keep its surface temperature in balance.
Estimate the temperature Earth's surface will need to attain in order to radiate that much thermal energy. You will need to use the formula for emitted power per unit area. (Assume that Earth's temperature today is around 300 K.)
Earth's surface would need to attain a temperature of 12,742 K in order to radiate 3,000 times as much thermal energy
The emitted power per unit area of a black body is given by:P = σT^4 Where is the σ Stefan-Boltzmann constant and T is the temperature in Kelvin.
Therefore, we can solve for the temperature that Earth's surface would need to attain in order to radiate 3,000 times as much thermal energy by rearranging the equation to solve for T:
T = (P/σ)^1/4
T = (3000/σ)^1/4
T = (3000/5.67x10^-8)^1/4
T = 12,742 K
Therefore, Earth's surface would need to attain a temperature of 12,742 K in order to radiate 3,000 times as much thermal energy.
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An athlete at the gym holds a 3.0 kg steel ball in his hand. His arm is 70 cm long and has a mass of 4.0 kg. Assume, a bit unrealistically, that the athlete's arm is uniform.
What is the magnitude of the torque about his shoulder if he holds his arm straight out to his side, parallel to the floor? Include the torque due to the steel ball, as well as the torque due to the arm's weight.
What is the magnitude of the torque about his shoulder if he holds his arm straight, but 40 ∘ below horizontal?
The magnitude of the torque about his shoulder if he holds his arm straight, but 40 ∘ below horizontal is 40 Nm.
Arm Weight: 4 kilogram
Ball weight: 4 kilogram
arm span: 70 cm
You must first determine the weights of the arm and the ball. Add the gravity factor to them.
Arm weight: 4 kg times 9.8 equals 39.2 Ball weight: 4 kg times 9.8 equals 39.2
In order to find the torque, = r1 F1 sin + r2 F2 sin,
We must determine r1 and r2, where r1 = 70/2 = 35 cm or.35 m. (arm: to find the center of gravity, divide by 2)
r2 = 70 cm, or.70 m (ball)
The angle is 180° since the arms are extended straight out, which equals m1g(L/2) + m2gL.
The system's length is L.
τ =4 * 9.8 *(0.7/2) + 4 * 9.8 * 0.7 \s
= 40 Nm
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if it rotates through 8.00 revolutions in the first 2.50 s, what is the wheel’s angular acceleration?
The wheel rotate through 64 revolutions in the next 5.00 s
Using 2nd rotational kinematic equation:
\theta = wi*t + (1/2)*\alpha*t^2
From the question, we have
t = 2.50 sec, \theta = 8.00 rev = 8.00*2*pi rad,
wi = initial angular velocity = 0 rad/sec
So,
16.00*pi = 0*2.50 + (1/2)*\alpha*2.50^2
\alpha = 2*16.00*pi/2.50^2 = 16.08 rad/sec^2
Now in t = 7.50 sec (next 5.00 sec)
number of revolutions will be:
\theta1 = 0*7.50 + (1/2)*16.08*7.50^2 = 452.25 rad
So revolutions will be:
\theta1 = 452.25/(2*pi) = 72.0 rev
revolutions = \theta1 - \theta = 72.0 - 8.00 = 64.0 rev
Multiplication:
It is a fundamental operation in mathematics that is frequently utilized in everyday life. When we need to combine groups of similar sizes, we utilize multiplication. The fundamental concept of repeatedly adding the same number is represented by the process of multiplication.
Complete question:
A wheel rotates from rest with constant angular acceleration. If it rotates through 8.00 revolutions in the first 2.50 s, how many more revolutions will it rotate through in the next 5.00 s?
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Two charged particles repel each other with a force f. If the charge on only one of the particles is doubled and the distance between them is also doubled, then the force will be.
Two charged particles repel each other with a force f. If the charge on only one of the particles is doubled and the distance between them is also doubled, then the force will be multiplied by a factor of 8.
Do two charged objects repel?The electric field and resulting forces produced by two electrical charges of the same polarity. The two charges repel each other. If a positive charge and a negative charge interact, their forces act in the same direction, from the positive to the negative charge.Like charges (two negatively charged particles or two positively charged particles) repel each other while opposite charges (a positively charged particle and a negatively charged particle) attract. Negatively charged particles repel each other due to electricity.Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges. The size of the force varies inversely as the square of the distance between the two charges. We can calculate this problem using the Coulomb’s Law equation.If the charges on both objects are negative, both objects will repel. If the charges on one object is positive and the charge on another object is negative, then the objects will attract.F = k * q1 * q2 / d^2
Where:
F = electrical force between the two particles
k = Coulomb's law constant
q = quantity of charge
d = distance between the two particles
Let’s say that only the charge of q1 is doubled and the distance is halved. Therefore the new force would be:
F (new) = k * 2q1 * q2 / (d / 2)^2
F (new) = 8 k * q1 * q2 / d^2
F (new) = 8 * F (initial)
Therefore the force is multiplied by a factor of 8.
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g 13. how fast is a 500 g ball that has a kinetic energy of 4.0 j? a) 4.0 m/s b) 0.13 m/s c) 2.0 m/s d) 1.6 m/s e) 20 m/s
The 500g ball with 4.0 J of kinetic energy, v = √(2*4.0 J/500g) = 2.0 m/s.
What is kinetic energy?
Kinetic energy is the energy associated with movement. It is the energy an object has due to its motion. Kinetic energy can be either potential or kinetic. Potential energy is stored energy and is the energy an object has due to its position or state. Kinetic energy is the energy of movement, and is the energy an object has due to its velocity. Kinetic energy is a function of the mass and velocity of an object. The kinetic energy of an object is equal to one half of its mass multiplied by the square of its velocity. Kinetic energy can be converted into other forms of energy, such as heat, sound, and light. Kinetic energy can also be converted into work, such as when a car accelerates or brakes. Ultimately, kinetic energy is the energy of motion and can be used to do work.
Kinetic energy (KE) of a moving object is equal to 1⁄2 its mass (m) multiplied by its velocity (v) squared.
KE = 1/2 mv2.
Rearranging this equation, we can calculate the velocity of an object given its mass and its kinetic energy.
v = √(2KE/m).
Thus, for the 500g ball with 4.0 J of kinetic energy, v = √(2*4.0 J/500g) = 2.0 m/s.
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