True or false? The asteroid belt is inside the Sun’s Roche limit and thus could not overcome the Sun’s tidal forces to form a planet.

True or false? The time interval when a specific comet’s tail is long is much less than the time interval when that comet’s tail is short.

True or false? The asteroid belt was probably produced when two large, fully formed terres-trial planets collided with and shattered each other.

True or false? Most meteor showers occur when a random comet or asteroid enters Earth’s atmosphere and then breaks up into many pieces.

True or false? Most of the Kuiper-belt objects are between the orbits of Neptune and the Oort cloud.

True or false? The peculiar distribution of certain types of Kuiper-belt objects suggests the gravitational influence of a very distant, massive “Planet Nine” that astronomers are now trying to find.

1a) A copper wire 4.4 um in diameter and 318.9 um long has a temperature at one end of 35 °C and 32 °C at the other. Calculate the rate of heat flow through the wire, in Watts. (For copper kC= 400 W/mK)

1)b) The thermal conductivity of air at room temperature is 0.028 W/mK and its density is 1.16 Kg/m³. The average air molecule travels at 525.4 m/s and collides about every 267 ps with another air molecule. How much heat (in J) is needed to raise the temperature of a cubic meter of air by 10 °C?

Consider a system of an 85.0 kg man, his 20.5-kg dog, and the earth. The gravitational potential energy of the system increases by 1.90 10³ J when the man climbs a spiral staircase from the first to the second floor of an apartment building. If his dog climbs a normal staircase from the same first floor to the second floor, by how much does the potential energy of the system increase (in J)?

Two blocks, of 2.0 kg each, are attached by a string and slide down a ramp making an angle of 50° with the horizontal. Mass ?1 has a coefficient of kinetic friction of 0.60, and mass ?2 has a coefficient of kinetic friction of 0.40. 10. Find the acceleration of the blocks. 11. Find the tension in the string.

A 5.61μC and a -2.04μC charge are placed 19.0cm apart. Where can a third charge be placed so that it experiences no net force? [Hint: Assume that the negative charge is 19.0cm to the right of the positive charge.]

Pressure for air and fluids can be measured and used to fly, float, blow, suck or coast according to specific laws and principles. Terminology can change for the same actions if used with water or with air.

1) These terms are used in the chapter. Give an example of an item that illustrates your definition. Is there a formula or measurement unit that is commonly used?

give an Example & Formula of each term

Newton's 1st law of Motion

Newton's 2nd law of Motion

Newton's 3rd law of Motion

Hooke’s Law

Pascal’s Law

Bernoulli Principle

LaPlace’s Law

Archimedes Principle

1.

DETAILS

MY NOTES

You decide to suspend a 2 kg toy with a string attached to the ceiling for your playful cat. Before the frisky feline starts to play with it, find the tension in the string.

N

2. Suppose a book of mass 4 kg slides down an incline at constant velocity of 2 m/s. The net force on the book is...N

3.

DETAILSMY NOTES

Suppose a book of mass 3 kg slides down an incline at constant acceleration of 1 m/s^2. The net force on the book is

N

4.

DETAILSMY NOTES

Two horizontal forces (F1 and F2) are acting on a 3.7 kg box. Only F1 = 1.7 N is shown in the figure. As shown in the figure, a positive answer for F2 means that it points to the right (negative means it points to the left). Ignore friction. Find F2 when the acceleration of the box is 2 m/s^2.


N

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DETAILSMY NOTES

A car of mass 2050 kg traveling at speed 23 m/s crashes in a one dimensional collision into the rear of a slower moving truck of mass  2875 kg traveling at 8.8 m/s in the same direction. If the collision is perfectly inelastic, what is the speed of the combined car and truck after the collision?

m/s



A car of mass 2050 kg traveling at speed 23 m/s crashes in a one dimensional collision into the front of a slower moving truck of mass  2875 kg traveling at 8.8 m/s in the opposite direction. If the collision is perfectly inelastic, what is the velocity of the combined car and truck after the collision?(Take the positive direction to be the initial direction of the car.)

m/s



A car of mass 2050 kg traveling at speed 23 m/s crashes into a truck of mass  2875 kg traveling at 8.8 m/s that falls (for some reason) vertically. If the collision is perfectly inelastic, what is the velocity of the combined car and truck after the collision?(Take the positive direction to be the initial direction of the car.)

m/s

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DETAILSMY NOTES

We are in a parallel universe where you have a mass of 70 kg. In these hard times (apparently the Corona virus is here too), you decided to rob a bank and Spiderman caught you. Thats not good. You try to run away. Before Spiderman's spider string catches you, you are traveling at a speed of 4 m/s. The initial attachment of the spider string immediately slows you down to a speed of 1 m/s. You are still running away, albeit slower. What is the magnitude of the impulse you experience from the spider string.  

kg-m/s

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DETAILSMY NOTES

You slide your 1.5 kg beverage across the table. Thankfully, it doesn't spill. If the coefficient of kinetic friction between the table and beverage is 0.43, find the magnitude of the acceleration. (As a reminder, magnitude means your answer should be positive.)

m/s^2

8.

DETAILSMY NOTES

A 11 kg package is sliding down a hill with an incline angle of 21 degrees from a horizontal surface. If the package slides down the hill at a constant velocity of 0.9 m/s, find the magnitude of the friction force. Yes, it is possible to solve this problem without the coefficient of kinetic friction; it arguably makes the problem easier. (As a reminder, magnitude means your answer should be positive.)

N

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DETAILSMY NOTES

With the exception of gravity and normal force, only the following two forces are acting on a dresser of mass 11 kg moving across a horizontal surface. Vector 1 has a magnitude of 2.6 with an angle from the horizontal of 36. Vector 2 has a magnitude of 2.1 and an angle from the horizontal of 19 degree. Find the acceleration of the dresser.

m/s^2

10.

DETAILSMY NOTES

Cindy who is 58 kg pushes on Joe who is 72 kg. She pushes on Joe with a force of 108 N. With what magnitude of force does Joe push on Cindy during that same push? (As a reminder, magnitude means your answer should be positive.)

N

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DETAILSMY NOTES

I lift my physics textbook a height of 1 m. What is the total work done on the book by all forces if I lift the book at a constant velocity of 2.6 m/s. Ignore air resistance.

J

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DETAILSMY NOTES

A 1.6 kg ball is held at a height of 1 m above the ground. If it is dropped, what will its kinetic energy be immediately before it hits the ground? You may ignore air resistance.

J

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DETAILSMY NOTES

I apply a horizontal force of 159 N to a 1.2 kg box being pushed across a horizontal surface. The coefficient of friction is 0.44. If the box is pushed 0.41 m, what is the work done by friction? Think carefully about what should be the sign of the work too.

J

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DETAILSMY NOTES

A treasure slides down a 48 meter tall incline with an incline angle of 3.6 degrees at a constant speed of 0.21 m/s. What is the TOTAL work done on the treasure chest?

J

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DETAILSMY NOTES

A 17.5 kg object starts at the top of a 5.4 m tall hill at rest. At the bottom of the hill that it slid down, it has a velocity of 2.5 m/s. What is the work done by friction? (As with the work done by any force, I encourage you to think about what the sign of work done by friction should be when inputting your answer.)

J

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DETAILSMY NOTES

My child has left a 3 kg toy on one of the bottom stairs at a height of 1.3 m from the ground. After frustration that my child still hasn't put the toy away, I throw it up the stairs to a height of 3.4 m above the ground. What is the change in the potential energy that the toy experienced due to this throw?

J

17.

DETAILSMY NOTES

A 0.147 kg baseball is traveling at 16.9 m/s towards a baseball hitter. The baseball player hits the ball in the opposite direction from the pitch. The speed of the ball after the hit is 23.9 m/s. If the time period of the ball in contact with the bat is 0.1 seconds, what is the magnitude of the force that the bat puts on the ball?  

N

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DETAILSMY NOTES

An object of mass 10 kg has an x component of velocity of 5 m/s and a y component of velocity of 7 m/s. What is the magnitude of the total momentum of the object?  

kgm/s

PLEASE SHOW ALL WORK.

Explain the meaning of the Virial Theorem, i.e., E = −U/2, where E is the star’s total energy while U is its potential energy.

explain how free electron contribute to the number of Cv(T) of solid state and how to get that by experiment

1) Two particles with charges q1 = -6 μC and q2 = 2 μC, respectively, situated at corners of a rectangle of sides a = 10 m and b = 20 m. What Is The Electric Potential At The Corner with the right angle

2) Two particles with charges q1 = 6 C and q2 = -2 C, respectively, situated at corners of a rectangle of sides a = 10 m and b = 20 m. What Is The Electric Potential At The Corner with the right angle

The fermi energy of silver is given as 5.49 eV. a) Find the densities of electron and atom per volume. b) Find the fermi velocity of electron in silver c) The current value flowing through silver is 2 A. The cross sectional area of silver is 0.5 cm2. Find the drift velocity of electron in silver according to given conditions. d)Find the collision time  for an electron for sliver. (the definition of current density is the current per cross sectional area, the resistivity value of silver is 1.59x10-8 ohm.m,

explain and prove the T^3 debye law

A 3.1 kg rod of length 5.1 m has at opposite ends point masses of 4.0 kg and 6.0 kg.
a)Will the center of mass of this system be nearer to the 4.0-kg mass, nearer to the 6.0-kgmass, or at the center of the rod?   
b) Where is the center of mass of the system?

(F-net=M[Vcm/t] xCM= (summation of all mass by distance)/system of mass

Diagram please, not fully understand the system. getting 5.03m

1. Consider the time dependent Hamiltonian H=H0+W(t). |φn is a basis of H₀. When t<0, the system is in one of the eigen states, |φi, of the unperturbed Hamiltonian H₀. At ?=0 an, a time dependent perturbation Wt=Ccos(ωt) is applied to the system for a sufficiently long time, here C is a complex number and w is the angular frequency of the applied perturbation. Calculate the probability of finding the system in |φf eigen states of H₀ when the system in resonance ω≈ωfi. Assume also that Ef-Eiℏ=ωfi >0.