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Applied Physics

Dale Ewen, Neill Schurter, Erik Gundersen

Chapter 6

Momentum - all with Video Answers

Educators

KC

Chapter Questions

03:03

Problem 1

A truck with mass 1475 slugs travels $57.0 \mathrm{mi} / \mathrm{h}$. Find its momentum.

KC
Kyle Covington
Numerade Educator
01:30

Problem 2

A projectile with mass $27.0 \mathrm{kg}$ is fired with a momentum of $5.50 \mathrm{kg} \mathrm{m} / \mathrm{s}$. Find its velocity.

KC
Kyle Covington
Numerade Educator
01:07

Problem 3

A box is pushed with a force of $125 \mathrm{N}$ for $2.00 \mathrm{min} .$ What is the impulse?

KC
Kyle Covington
Numerade Educator
00:44

Problem 4

What is the momentum of a bullet of mass $0.034 \mathrm{kg}$ traveling at $250 \mathrm{m} / \mathrm{s} ?$

KC
Kyle Covington
Numerade Educator
02:35

Problem 5

A 4.00-g bullet is fired from a 4.50-kg gun with a muzzle velocity of 625 $\mathrm{m} / \mathrm{s}$. What is the speed of the recoil of the gun?

KC
Kyle Covington
Numerade Educator
01:45

Problem 6

A 150 -kg pile driver falls from a height of $7.5 \mathrm{m}$ to hit a piling. (a) What is its speed as it hits the piling?
(b) With what momentum does it hit the piling?

KC
Kyle Covington
Numerade Educator
08:39

Problem 7

A 15.0 -g bullet is fired at a muzzle velocity of $3250 \mathrm{m} / \mathrm{s}$ from a high-powered rifle with a mass of $4.75 \mathrm{kg}$ and barrel of length $75.0 \mathrm{cm}$. (a) How long is the bullet in the barrel? (b) What is the force on the bullet while it is in the barrel?
(c) Find the impulse exerted on the bullet while it is in the barrel. (d) Find the bullet's momentum as it leaves the barrel.

KC
Kyle Covington
Numerade Educator
03:49

Problem 8

What force is required to slow a 1250 -kg car traveling $115 \mathrm{km} / \mathrm{h}$ to $30.0 \mathrm{km} / \mathrm{h}$ within $3.50 \mathrm{s} ?$ (a) How far does the car travel during its deceleration?
(b) How long does it take for the car to come to a complete stop at this same rate of deceleration?

Vishal Gupta
Vishal Gupta
Numerade Educator
04:42

Problem 9

One ball of mass 575 g traveling $3.50 \mathrm{m} / \mathrm{s}$ to the right collides with another ball of mass $425 \mathrm{g}$ that is initially at rest. After the collision, the lighter ball is traveling $4.03 \mathrm{m} / \mathrm{s} .$ What is the velocity of the heavier ball after the collision?

KC
Kyle Covington
Numerade Educator
02:38

Problem 10

A railroad car of mass $2.25 \times 10^{4} \mathrm{kg}$ is traveling east $5.50 \mathrm{m} / \mathrm{s}$ and collides with a railroad car of mass $3.00 \times 10^{4} \mathrm{kg}$ traveling west $1.50 \mathrm{m} / \mathrm{s}$. Find the velocity of the railroad cars that become coupled after the collision.

KC
Kyle Covington
Numerade Educator
04:13

Problem 11

A 195-g ball traveling 4.50 $\mathrm{m} / \mathrm{s}$ to the right collides with a $125-\mathrm{g}$ ball traveling $12.0 \mathrm{m} / \mathrm{s}$ to the left. After the collision, the heavier ball is traveling $8.40 \mathrm{m} / \mathrm{s}$ to the left. What is the velocity of the lighter ball after the collision?

KC
Kyle Covington
Numerade Educator
08:48

Problem 12

Two trucks of equal mass collide at a $90^{\circ}$ intersection. If the momentum of truck $A$ is $9.50 \times 10^{4} \mathrm{kg} \mathrm{km} / \mathrm{h}$ east and the momentum of truck $\mathrm{B}$ is $1.05 \times 10^{5} \mathrm{kg} \mathrm{km} / \mathrm{h}$
north, what is the resulting momentum of the final mass, assuming the trucks remain joined together following the crash?

KC
Kyle Covington
Numerade Educator
06:37

Problem 13

Ball A, of mass $0.35 \mathrm{kg}$, has a velocity $0.75 \mathrm{m} / \mathrm{s}$ east. It strikes a stationary ball, also of mass $0.35 \mathrm{kg} .$ Ball A deflects off $\mathrm{B}$ at an angle of $37.0^{\circ}$ north of A's original path. Ball B moves in a line $90^{\circ}$ right of the final path of A. (a) Find ball A's momentum after the collision.
(b) Find ball B's momentum after the collision.
(c) Find the velocity of A after the collision.
(d) Find the velocity of $\mathrm{B}$ after the collision.

Urvashi Arora
Urvashi Arora
Numerade Educator