Receive heat from a high-temperature source and reject heat to a low-temperature sink are the characteristics of all heat engines.
What is High-temperature sources?High-temperature sources are materials that can produce and sustain high temperatures. These sources can range from small, localized heating elements to large, complex nuclear reactors. Common high-temperature sources include fossil fuels, such as wood, coal, and oil, as well as nuclear and solar energy. High-temperature sources are used in a variety of applications, including power generation, heating and cooling, and manufacturing processes.
Heat engines transfer heat from a high-temperature source to a low-temperature sink, so they cannot reject heat to a high-temperature sink or receive heat from a low-temperature source.
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calculate the second and third viraial coefficients( b and c) for a gas obeying the van der waals equation
The van der Waals equation is a modified version of the ideal gas equation that accounts for the finite size of gas molecules and the attractive forces between them. The equation is given by:
[tex](P+a/V^{2})(V-b) = RT[/tex]
The virial coefficients (b and c) are used to describe the behaviour of a gas in terms of the interactions between its molecules.
To calculate the second virial coefficient (b), we can integrate the van der Waals equation over the volume:
[tex]b = (\frac{2\pi }{3})^{2} *a^{\frac{3}{2} } m(-\frac{1}{2} )[/tex]
Where m is the molar mass of the gas.
To calculate the third virial coefficient (c), we need more information, such as the polarizability of the gas molecules and the interactions between them.
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A 20 g ball of clay traveling east at 2.0m/s collides with a 30 g ball of clay traveling 30∘ south of west at 1.0m/. What is the speed of the resulting 50 g blob of clay? What is the direction of the resulting 50 g blob of clay?
The speed of the resulting 50 g blob of clay is 0.5003 m/s and the direction is 87.70⁰ south-west.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Appling conservation of momentum along north direction:
20 g × 2.0 m/s + 30 g × (- 1.0 m/s × sin30°) = (20 g + 30 g)× v₁
v₁ = 0.5 m/s
Appling conservation of momentum along east direction:
20 g ×0 m/s + 30 g × (- 1.0 m/s × cos 30°) = (20 g + 30 g)× v₂
v₂ = - 0.02 m/s.
Hence, the speed of the resulting 50 g blob of clay is
= √{(0.5)²+(0.02)²} m/s
= 0.5003 m/s.
The direction of the resulting blob of clay with east direction is =
tan⁻¹(0.5/(-0.02))
= - 87.70⁰
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dan koshland suggested the induced-fit mechanism for enzymes. which of the following cartoons illustrates the induced-fit hypothesis of enzyme-substrate interaction?
According to the induced fit theory by Daniel Koshland, binding of substrate to the enzyme brings a conformational change in the enzyme to either enhance or inhibit its activity.
which of the following cartoons illustrates the induced-fit hypothesis of enzyme-substrate interaction?
The induced-fit model states a substrate binds to an active site and both change shape slightly, creating an ideal fit for catalysis. Enzymes promote chemical reactions by bringing substrates together in an optimal orientation, thus creating an ideal chemical environment for the reaction to occur.The induced fit hypothesis states that while an enzyme is in the unbound state (i.e., not binding to the substrate), the active site is not structurally optimal for substrate binding.The Fischer's lock and key hypothesis and Koshland's induced fit hypothesis are two hypotheses suggested to explain catalyses and specificity of enzymes. The lock and key hypothesis us where the fit between the substrate and active site is very specific like that of a lock and key.To learn more about enzymes refers to:
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The acceleration of an object is in the positive x-direction at a particular instant. Based on this information, which one of the following statements about the object's motion must be true?
a. The object's speed is increasing.
b. The object's speed is decreasing.
c. The object's velocity is in the positive x-direction.
d. The object's velocity is changing, but it is unknown whether its speed is increasing or decreasing
Based on this information, the statement which is true about the object's motion is statement a. The object's speed is increasing.
The pace at which an object's velocity with regard to time changes is referred to as acceleration in mechanics. They are endogenous variables, accelerations. The direction of the total force exerted on an object determines the direction of its acceleration.
Motion in physics is the movement in an object's location with regard to its environment over a specific period of time. The phrases distance, displacement, and speed can be used to represent how an item moving with certain mass is moving. Motion is also mathematically characterised as the viewer's sense of perspective and the measurement of the shift in the body's position in relation to that frame over time.
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an object placed on an equal-arm balance requires 12kg to balance it. when placed on a spring scale, the scale reads 12kg. everything (balance, scale, set of weights and object) is now transported to the moon where the free-fall acceleration is one-sixth that on earth. the new readings of the balance and spring scale (respectively) are:
The new readings of the balance and spring scale are same as that of the old readings.
equal-arm balance = 12 kg
kg spring scale = 12 kg
Using a counter mass on the balance's opposing plate, the equal arm balance calculates an object's mass. Both the mass being measured and the mass standards being compared to are equally impacted by gravity.
The tested mass and the standard masses are thus equally affected by changes in the local gravitational field. Consider the spring scale in comparison. In such range, the spring delivers a calibrated level of force regardless of the gravitational field in the immediate area. Therefore, the force indicated is higher if the local gravity is higher.
Additionally, the stated force is lower when the gravitational field is smaller. Changes in the local gravitational field have no effect on the spring's force.
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The density of a solid object is defined as the ratio of the mass of the object to its volume. The dimension of density isa) ([M][L]b)[M] /[L]C) [M][L] ^-3D) [L]^3 / [M]
The dimensional formula of density is calculated from the formula of density to be ρ = [M] [L]⁻³ which is option (C).
There are only seven fundamental physical quantities. We may determine the dimension of any other physical quantity using these fundamental quantities. With the help of the dimensions of mass and length, we must determine the density dimension in this situation. Volume is a measure of length. Any dimensional formula is usually written in the form of mass [M], length [L] and time [T].
If an object has mass M and volume V then the density of the object is given by,
ρ = M/V
[ρ] = [M]/[V] = [M]/[L]³ = [M] [L]⁻³
Thus, the dimensional formula of density is [M] [L]⁻³.
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the following diagram shows a karyotype of a certain human. based on the karyotype, which of the following statements is most likely true?
A karyotype is an arrangement of chromosomes from a cell based on their shape, size, and position of their centromeres'.
what is karyotype?
karyotype is an individual's complete set of chromosomes. The term also refers to a laboratory-produced image of a person's chromosomes isolated from an individual cell and arranged in numerical order. A karyotype may be used to look for abnormalities in chromosome number or structure..
A karyotype test is a type of genetic testing. It looks at the size, shape, and number of chromosomes in a sample of cells from your body. Chromosomes are found in the cell nucleus, which is like the command center of a cell. Chromosomes contain your genes. karyotype is a number of chromosomes in a particular person. A karyotype can be used to know the chromosomal numbers or structural problems in an individual. There are 22 pairs of autosomal chromosomes and 1 pair of sex chromosomes.To learn more about karyotype refers to:
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on sunday night, a meteorologist records predicted daily high temperatures, in degrees fahrenheit, for the next seven days. at the end of each day, the meteorologist records the actual daily high temperature, in degrees fahrenheit. at the end of the seven-day period, the meteorologist would like to find the greatest absolute difference between a predicted temperature and a corresponding actual temperature.
temps, in ℉, for the following seven days, if (Math.abs(pred[i] – act[i]) > num); num Equal Math.abs(pred[i] - act[i]); The ordinary everyday temp, measured in ° C., is noted by the meteorologist at the close of each day.
what do weather forecasters do?The science of meteorology is concerned with the physical processes that occur in the Earth's atmosphere. Physicists who observe, investigate, or predict the weather are known as meteorologists.
Who is a meteorologist, exactly?A person with specific education who employs scientific concepts to explain, comprehend, observe, or forecast atmospheric events on earth, as well as how the atmosphere influences the earth & life on the planet, is known as a meteorologist.
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At what speed must it travel to have a
momentum of 7 x 105 kg · m/s?
Answer in units of m/s.
To gain momentum of 7*105 kg.m/s, the truck must travel at a speed of 46.67 m/s.
What is momentum?Momentum is defined in Newtonian mechanics as the product of an object's mass and velocity. It is a vector quantity with magnitude and direction. It is measured by "mass velocity," because momentum depends on velocity, and it also depends on the direction of the body's motion. Momentum is a vector quantity because velocity is a vector and mass is a scalar quantity. Momentum equals mass multiplied by velocity. Momentum is defined as "mass moving." Because all objects have mass, if an object moves, it has momentum - its mass is in motion.
Here,
P=mv
P=7*10^5 Kg.m/s
m=15000 kg
7*10^5=15000v
v=700/15
v=46.67 m/s
The truck must travel at the speed of 46.67 m/s to gain the momentum of 7*10^5 kg.m/s.
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in video 2 for chapter 17, they show a block of glass with 2 reflections of light. why are there two?
The second reflection is created as the light frvl as it passes through the block. Multiple pictures are created via surface diffraction.
Simply put, what is diffraction?The act of light spreading out after passing through a narrow area or bending around an object is known as diffraction. The dispersion of light waves is a topic covered in physics classes. Sound, television, and water waves are all susceptible to diffraction.
In a light wave, what is diffraction?Diffraction is the small bending of light that occurs when it travels around an object's edge. The degree of bending is influenced by the wavelength of light's size in relation to the opening's size. When the opening exceeds the wavelength of the light, the
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Part A If the switch in the circuit has been in position a for a long time, find the initial voltage across the capacitor at t = 0-
Vs = 4.0 V , Is = 38.0 mA , R1 = 21.0 kΩ , R2 = 80.0 kΩ , R3 = 92.0 kΩ , R4 = 88.0 kΩ , R5 = 16.0 kΩ , R6 = 36.0 kΩ , C = 60.0 μF .
Part B - Find the time constant, τ, after t = 0
Vs = 85.0 V , Is = 28.0 mA , R1 = 60.0 kΩ , R2 = 28.0 kΩ , R3 = 3.0 kΩ , R4 = 2.0 kΩ , R5 = 55.0 kΩ , R6 = 64.0 kΩ , C = 2.0 μF .
Part C - Find the Norton equivalent current seen by the capacitor after t = 0
Vs = 83.0 V , R3 = 63.0 kΩ , R4 = 100.0 kΩ , R5 = 91.0 kΩ , R6 = 14.0 kΩ , C = 99.0 μF .
Part D - Write an expression for the capacitor voltage, v(t), for t ≥ 0
Express your answer as an algebraic expression in terms of Vs, Is, R3, R5, R6, C.
Part E - Write an expression for the power dissipated in the resistor R 6 for t ≥ 0+
Express your answer as an algebraic expression in terms of Vs, Is, R3, R5, R6, and C.
since the inductor current and capacitor voltage cannot change .
What is initial voltage across the capacitor?
The initial capacitor voltage was VC(0+) = 0 V. The time constant is τ = 10 s. The final value of the capacitor voltage, when the capacitor has gone to an open circuit, is VC,F = 5 V.The voltage across the capacitor can be found through, V = Q/C. The voltages across the other elements can be found with the help of Kirchoff's first law. The current through a capacitor must always decay and end up at zero, since charge can not contiuously flow through a capacitor.The initial voltage is actually the internal voltage before the source impedance. For the swing bus generator (G1) below, the initial voltage is the voltage of the source before the voltage drop across its internal impedance.To learn more about capacitor refers to:
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when light encounters a medium, the interference between the incident light and the light scattered by the medium leads to a wavefront that moves slower than the speed of light, c. the speed of light in the medium is given by v
The molecules and particles in a medium scatter light when it comes into contact with them, and as a result, the wavefront moves more slowly in a media than it would in a vacuum. v = c/n.
where c is the speed of light in a vacuum and n is the index of refraction of the medium, calculates the speed of light in a particular medium. The index of refraction is a measurement of how much light travels slower through a medium than it does in a vacuum. Light travels through a medium at a slower speed the higher the index of refraction. The wavefront is impacted by refraction, reflection, and other phenomena as it travels through the medium.
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pls answer this hard question
thanks :)
The temperature at which the two metals will touch each other is 505 ⁰C.
What is the temperature at which the two metals touch each other?The temperature at which the metals touch each other is calculated as follows;
L = ΔL / αΔθ
where;
ΔL is change in lengthL is the original lengthSince both metals have equal length, our new equation becomes;
ΔL₁ / α₁Δθ = ΔL₂ / α₂Δθ
where;
α₁ is linear expansivity of ironα₂ is linear expansivity of copperΔL₁ is extension of iron,ΔL₂ is extension of copperΔL₁ / α₁ = ΔL₂ / α₂
ΔL₁ / ΔL₂ = α₁ / α₂
ΔL₁ / ΔL₂ = ( 12 x 10⁻⁶ ) / ( 19 x 10⁻⁶ )
ΔL₁ / ΔL₂ = 0.63
ΔL₁ = 0.63ΔL₂
The expansion of the two metals will be equal to 1.55 cm gap.
ΔL₁ + ΔL₂ = 1.55 cm
0.63ΔL₂ + ΔL₂ = 1.55
1.63ΔL₂ = 1.55
ΔL₂ = 1.55 / 1.63
ΔL₂ = 0.95 cm
The change in temperature is calculated as follows;
Δθ = ΔL₂ / (L₂α₂)
Δθ = ( 0.95 ) / ( 100 x 19 x 10⁻⁶ )
Δθ = 500 ⁰C
The temperature at which the two metals will touch each other is calculated as follows;
T - T₀ = Δθ
T = Δθ + T₀
T = 500 ⁰C + 5 ⁰C
T = 505 ⁰C
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the diagrams below show different objects of equal masses that are acted on by one or more forces. in the diagrams below, each force vector labeled f has the same magnitude.
Which of the four objects shown has a net zero force acting on it?
a. (i)
b. (ii)
c. (iii)
d. (iv)
The figure (i) (attached below) will have net zero force acting on it.
In the given figure forces of equal magnitudes are acting on it but in opposite directions. So, the cancel out to zero .
The push or pull on an object with mass causes it to change its velocity is called force.Force is defined as an external cause that changes or tends to change the state of the body once applied. If the body is in motion, it comes to rest, and if at rest, then it will come to motion. It can also cause a change in the direction, shape, size, etc., of the body. A force is an external agent that may change the condition of rest or motion of a body. It has a magnitude as well as a direction. The direction of the force is the place where force is applied, and the application of force is the location where force is applied.The vector product of mass (m) and acceleration (a) expresses the quantity of force. The equation or the formula for force may mathematically be stated in the form of :F=ma
Where, m= mass,
a= rate of acceleration
The force applied on an object is measured in terms of Newton and dyne. Force is measured in dyne in the centimetre gram second system of unit (CGS unit). It is represented in Newton (N) in the standard international system of units (SI unit).To know more about force visit:
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a block of mass m on an inclined surface is attached to a spring of negligible mass, as shown. the other end of the spring is attached to a wall, and there is negligible friction between the block and the incline. the block is pulled to a position such that the spring is stretched from its equilibrium position. the block is then released from rest. which of the following systems can be classified as a closed system? responses a system consisting of the block only a system consisting of the block only a system consisting of the spring and earth a system consisting of the spring and earth a system consisting of the block and spring a system consisting of the block and spring a system consisting of the block, spring, and earth
Block with spring plus wall together can be classified as a closed system
1. Closed system is imaginary boundary through which no force interact. Or we say that closed system is system on which net force is zero.
2. Now consider block
There are force act by spring on block.
3. Now consider spring
There are two force at end of spring. On one end of spring force is act by block. While on second end of spring force is act by wall.
4. Now consider wall
There are force act by spring on wall.
5. For closed system, there should be zero force on system.
So we have take block, spring and wall as a closed system.
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consider a scenario in which there is no agreement between parties who are purchasing a new vehicle regarding the time, manner, or place of delivery of the vehicle. which of the following is an accurate statement regarding the uniform commercial code article 2 and the purchase of a new vehicle within as it pertains to this scenario?
The shipping costs of the vehicle would be borne by the consumer is an accurate statement regarding the uniform commercial code article 2 and the purchase of a new vehicle within as it pertains to this scenario.
The purchase of new vehicles is nothing but a purchase of a good as that term is defined by the article 2 of the Uniform Commercial Code.
The Uniform Commercial Code has protections on behalf of the buyer.
The UCC has numerous provisions to help parties amend contracts through writings and permits that additional items can be easily added to a contract between parties.
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Three pairs of balls are connected by very light rods as
shown in Figure P7.40. Rank in order, from smallest to larg-
est, the moments of inertia I₁, I2, and I3 about axes through the
centers of the rods.
m
FIGURE P7.40
TI
R
1
m/2
m
2m
2R
3
R/2
2
m
m/2
The moments of inertia are ranked as follows, from smallest to largest is I₁ < I₂ < I₃.
Moment of inertia is a physical quantity that measures an object's resistance to rotational motion. It is defined as the sum of the products of the mass of each particle in a system and the square of its perpendicular distance from the axis of rotation.
The formula for moment of inertia is:
I = Σmr²
where I is the moment of inertia, m is the mass of each particle in the system, r is the perpendicular distance of each particle from the axis of rotation, and the symbol Σ indicates a summation over all particles in the system.
Moment of inertia plays a crucial role in rotational motion, just as mass plays a crucial role in linear motion. It determines how much torque is required to produce a certain amount of rotational acceleration, and how quickly an object will respond to an applied torque.
The moment of inertia of an object depends on its shape and the distribution of mass within that shape. Objects with more mass distributed farther from the axis of rotation will have a higher moment of inertia and will be more resistant to rotational motion.
Moment of inertia is an important concept in many areas of physics and engineering, such as the design of rotating machinery, the motion of planets and other celestial bodies, and the behavior of molecules in quantum mechanics.
Here in the question,
To rank the moments of inertia I₁, I₂, and I₃ about axes through the centers of the rods, we need to use the parallel axis theorem, which states that the moment of inertia about an axis parallel to an axis passing through the center of mass of the object is equal to the moment of inertia about the center of mass plus the product of the mass and the square of the distance between the two axes.
Let's denote the distances between the centers of mass and the rods as r₁, r₂, and r₃, respectively.
Then we have:
I₁ = I₁_cm + m(r₁ + R/2)^2
I₂ = I₂_cm + m(r₂ + 2R)^2
I₃ = I₃_cm + m(r₃ + R/2)^2
To rank the moments of inertia, we need to compare the values of (r + R/2)^2, (r + 2R)^2, and (r + R/2)^2 + R²/4 for each of the pairs of balls. We can see that the last term is the same for all pairs of balls, so we only need to compare the first two terms for each pair.
For pair 1, we have:
(r₁ + R/2)^2 < (r₂ + 2R)^2
since r₁ < r₂.
For pair 2, we have:
(r₂ + 2R)^2 < (r₃ + R/2)^2 + R²/4
since r₂ < r₃.
Therefore, the moments of inertia are ranked from smallest to greatest is I₁ < I₂ < I₃.
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Which perspective studies help behavior and cognitive processes vary among cultures
part a compare the energy of a 1-megaton hydrogen bomb to the energy released by a major earthquake.
The energy of a 1-megaton hydrogen bomb will be 5 times to the energy released by a major earthquake.
A weapon with a 1 megaton yield would be as powerful as 1 million tonnes of TNT. In terms of joules, a megaton is equal to 4.18 1015. A 1-megaton hydrogen bomb will have a 5 times greater energy output than a large earthquake. An earthquake emits energy at a variety of frequencies, so all of the shaking frequencies during the entire event must be taken into account in order to get an appropriate figure. The observed amplitude increases tenfold with each whole number rise in size, while the energy released is 32 times greater.
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a scientist describes an electrically neutral atom with a model that consists of a nucleus that is a point particle with a positive charge
According to Thomson's atomic model, an atom is made up of a positively charged sphere into which negatively charged electrons are implanted.
Define neutral atom ?
When an atom has an equal number of electrons and protons, it has an equal number of negative (the electrons) and positive electric charges (the protons). As a result, the atom's total electric charge is zero, and it is said to be neutral.Heavier atoms tend to have more neutrons than protons, but the number of electrons in an atom is always equal to the number of protons. So an atom as a whole is electrically neutral.The number of protons (positively charged) and electrons (negatively charged) are equal in an atom. Therefore the opposite charges are balanced and thus there is no net charge on the atom. Moreover, neutrons present in the atom have no charge. Hence an atom is electrically neutral.To learn more about neutral atom refers to:
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a locomotive is accelerating at 3.12m/s^2. It passes through a 24.8m wide crossing in a time of 2.21s. After the locomotive leaves the crossing, how much time is required until its speed reaches 33.2 m/s?
The time required until the locomotive's speed reaches 33.2 m/s is 7.04 second.
What is acceleration?
Acceleration is rate of change of velocity with time. Due to having both direction and magnitude, it is a vector quantity. Si unit of acceleration is meter/second² (m/s²).
Acceleration of the locomotive: a = 3.12 m/s².
Initial speed of the locomotive: u = 24.8 m/2.21 s = 11.22 m/s.
Final speed of the locomotive: v = 33.2 m/s.
Let, time interval = t
So, v = u - at
t = (v -u)/a
= (33.2 - 11.22)/3.12 second
= 7.4 second.
Hence, the time required until the its speed reaches 33.2 m/s is 7.04 second.
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consider the circuit shown. the values of the resistors capacitors and battery voltage are provided. initially the capacitors are uncharged
Uncharged capacitor there is a flow of electrons from charged to uncharged until a steady state situation is arrived. I.e. After this no transfer of charge happens i.e. both the capacitors are in equilibrium condition.
What is meant by electrons?
A negatively charged subatomic particle known as an electron can either be free or attached to an atom (not bound).One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.The nucleus of an atom is made up of electrons, protons, and neutrons together.The negatively charged particles known as electrons revolve around the outside of the nucleus.For scientists, it can be challenging to monitor them because of how quickly they spin.The tiniest particles in an atom, you can put 2000 of them into a proton, they are drawn to the positive charge of the protons.To learn more about electron refer to
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a car travels along stright line at constant speed of 20 m/s for a distance d and then another distance in the same direction at constant speed of 30 km/hr. what is averege speed of the entire trip?
A car traveling at a constant speed of 20 m/s has travelled 3 minutes × 60 seconds/minute * 20 m/s = 3600 meters after 3 minutes.
What is speed?The rate at which an object's position changes in any direction is referred to as its speed. The ratio of distance travelled to travel time is used to determine speed. Velocity and speed are two terms used to describe how quickly an object moves along a path. That is to say, velocity is a vector and speed is a scalar value.
Speed is defined as the rate at which a distance changes over time. The base units of distance and time are combined to form the SI unit of speed. Distance multiplied by speed Time is equal to one metre per second. The SI unit for speed is the m/s.
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an object in a fluid experiences a buoyant force from the fluid. if the object is completely immersed, which of the following does the magnitude of this force depend on? select all that apply.
The fluid exerts a buoyant pull on an object when it is submerged in it. if the item is fully submerged. The amount of buoyancy an object experiences depends on both the fluid's density and objects volume. Hence, option B is correct.
As the density of the fluid grows, the buoyant force becomes stronger. Similar to this, as an object's volume increases, so does the buoyant force. The buoyant force's strength can also be influenced by the air pressure, which can alter how much force an item perceives to be exerted at its greatest intensity. The buoyant force will have a greater impact on the object the deeper it is buried in the fluid. As a result, if the object is completely submerged, the buoyant force's strength will depend on the object's volume and the density of the fluid.
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The complete question is:
A fluid exerts a buoyant force on an object when it is submerged in it. Which of the following determines how strong this force will be if the object is fully submerged? select all that apply.
A) The body's mass, fluid density
B) Density of the fluid and body volume
C) The body's weight
D) Shape of the body
(UPDATED) Please answer the following questions requested bellow ↓
≈≡ EACH QUESTION IS 5 POINTS WHICH IS 30 POINTS IN TOTAL ≡≈
Millikan and Harvey set out to measure, the value of the elementary electric charge, hence for questions 1- B, 2- C, 3- D, 4-A, and 5- D.
What is an Oil drop experiment?If the top metal is negatively charged the positive charge of the droplets will be attracted to it. If droplets have three extra electrons it has three elementary charges.
The experiment involved looking at microscopic electrically charged oil droplets that were sandwiched between two parallel metal surfaces that served as the capacitor's plates.
Therefore, the evaporation of oil from droplets during the experiment is a potential source of excess charge.
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An optical fibre consists of a fused quartz core surrounded by cladding with a refractive index of 1.35. Considering the fused quartz’s refractive index to be 1.55, calculate the numerical aperture of the fibre.
Since the refractive index of the core is higher than that of the cladding, light in the core striking the cladding boundary at an angle steeper than the critical angle is reflected back into the core by total internal reflection.
What is refractive index?The numerical aperture (n12 - n22 = NA2) can be provided to find the refractive index of the cladding. The formula for determining the number of reflections in an optical fiber is: Number of reflections =lx=l3d= 2203106=57735 57000.Due to the helical nature of the optical path, this type of optical fiber works only if the wavelength is significantly smaller than the core radius. This means that the core of a step-index fiber has a constant refractive index.Since the refractive index of the core is higher than that of the cladding, light in the core striking the cladding boundary at an angle steeper than the critical angle is reflected back into the core by total internal reflection.to learn more about refractive index from the given link:
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1. What is the work done created when a vehicle is pushed by a force of 106N producing a distance of 10.5m?
2. What is the friction force if the coefficient of friction of a box in a ground is 0.3 and its mass is 101kg, and the gravitational acceleration is 9.81 m/s2?
3. What is the net work done if the change in kinetic energy 200 J
4. What is the net work done if an object of mass 50 kg initially moving at 2m/s increases its velocity to 6 m/s?
5. What is the final velocity of an object with a mass of 5.2kg if the initial velocity was 2 m/s and the net work done is 50 J.
6. If the mass of the object (M) is 2kg.
The force (F) of 58 N displaces the object M by 3 m. The coefficient of friction is 0.3 and the gravitational acceleration is 9.81 m/s2. Find the net work done.
HELP ASAP
The net work done is the sum of the work done by the force (F) and the work done by friction.
What is the net work done if the change in kinetic energy 200 J?The work done by force (F) is calculated as Force × Distance (F × d), which in this case is 58 N × 3 m = 174 Nm.The work done by friction is calculated as Force × Distance (μ × m × g × d), in this case 0.3 × 2 kg × 9.81 m/s2 × 3 m = 58.2 Nm.Therefore, the net work done is 174 Nm + 58.2 Nm = 232.2 Nm. This is the amount of work done when the object of mass 2 kg is displaced by a force of 58 N over a distance of 3 m, with a coefficient of friction of 0.3 and a gravitational acceleration of 9.81 m/s2.The net work done in this example is the sum of the work done by the force of 58 N and the work done by the frictional force.The work done by the force of 58 N is given by W = F x d = 58 N x 3 m = 174 J.The work done by the frictional force is given by W = Ff x d = Ff x d = 0.3 x 9.81 x 2 kg x 3 m = 29.22 J.Therefore, the net work done is the sum of both work, which is W = 174 J + 29.22 J = 203.22 J.This type of net work is known as the work of non-conservative forces, since the frictional force opposes the motion of the object and reduces the total energy of the system.To learn more about the work of non-conservative forces refer to:
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An astronaut of mass 60 kg is walking on the surface of a new planet. If their weight (in N) is twice their weight on Earth, what is the mass of the planet if it has the same radius as Earth (REarth=6.37×106m)? The mass of Earth is 5.97×1024kg.
The mass of the planet with the same radius as Earth is 3.05 × 10^24 kg.
What is mass?Mass is a measure of the amount of matter contained in an object. It can be measured using scales, balances or other measuring instruments. Mass is a fundamental property of all matter, and its measurement is the basis for many scientific and engineering calculations. Mass is not the same as weight, which is a measure of the force exerted by gravity on an object. Mass is often expressed in units such as kilograms or grams.
To calculate the mass of the planet, we must use Newton's Second Law of Motion, which states that the force (F) is equal to the mass (m) times the acceleration (a): F = ma. Since the astronaut's weight on the planet is twice what it is on Earth, the acceleration on the planet must be twice what it is on Earth. We can then use the equation F = mg (where m is the mass of the astronaut and g is the gravitational acceleration on Earth) to calculate the acceleration on the new planet.
We know that the gravitational acceleration on Earth is 9.81 m/s2, so the gravitational acceleration on the new planet is twice that, or 19.62 m/s2. We can now use Newton's Second Law of Motion to solve for the mass of the planet:
F = ma
mg = ma
m = (mg)/a
m = (60kg * 9.81m/s2)/(19.62m/s2)
m = 3.05 × 10^24 kg
Therefore, the mass of the planet with the same radius as Earth is 3.05 × 10^24 kg.
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a rocket is to be launched from deep space where there is no gravitational field. 81% of the initial mass of the rocket is fuel and this fuel is injected with a relative velocity of 2300 m/s.
The rocket's initial upthrust when it first starts traveling upwards is 2300 N.
What is force?A force is an effect in physics that may modify the velocity of an item. A force can cause a mass item to change its velocity, or accelerate. Intuitively, force may be characterized as a push or a pull. A force is a vector quantity since it has both magnitude and direction. The term "force" has a specific meaning in science. At this level, it is quite acceptable to refer to a force as a push or a pull. A force is not something that an item possesses or possesses. Another item applies a force to another. The concept of a force is not restricted to living or nonliving entities.
Here,
It ejects fuel vapours at the rate of 1 kg/sec. this fuel is injected with a relative velocity of 2300 m/s.
F=dm/dt*v
=1*2300
=2300 N
The initial upthrust on the rocket when it just starts moving upwards is 2300 N.
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A 5 C charge is 10 m from a - 2 C charge. The electrostatic force (F) on the positive charge is:
The electrostatic force(F) on the positive charge 5C is -9 ×[tex]10^{8}[/tex]
Given:
First Charge, q1= 5 C
Second Charge, q2= -2 C
According to coulomb's law;
[tex]F = \frac{Kq1_{1} q2_{2} }{r^{2} }[/tex]
Here
[tex]K=9[/tex]× [tex]10^{9} N.m^{2} /C^{2}[/tex]
After substituting the given values, we have
[tex]F=\frac{9 * 10^{9} * 5 *(-2) }{10^{2} }[/tex]
F= -9 ×[tex]10^{8}[/tex]
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