Applied Physics

Dale Ewen, Neill Schurter, Erik Gundersen

Chapter 6 Momentum - all with Video Answers

Educators

Section 1

Momentum and Impulse

00:56

Problem 1

Find the momentum of each object.
$\quad m=2.00 \mathrm{~kg}, v=40.0 \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

00:53

Problem 2

Find the momentum of each object.
$\quad m=5.00 \mathrm{~kg}, v=90.0 \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

01:07

Problem 3

Find the momentum of each object.
$m=17.0$ slugs, $v=45.0 \mathrm{ft} / \mathrm{s}$

Shahab Ullah

Numerade Educator

00:53

Problem 4

Find the momentum of each object.
$\quad m=38.0 \mathrm{~kg}, v=97.0 \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

01:02

Problem 5

Find the momentum of each object.
$m=3.8 \times 10^{5} \mathrm{~kg}, v=2.5 \times 10^{3} \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

00:57

Problem 6

Find the momentum of each object.
$\quad m=3.84 \mathrm{~kg}, v=1.6 \times 10^{5} \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

01:39

Problem 7

Find the momentum of each object.
$F_{w}=1.50 \times 10^{5} \mathrm{~N}, v=4.50 \times 10^{4} \mathrm{~m} / \mathrm{s}$

Shahab Ullah

Numerade Educator

01:47

Problem 8

Find the momentum of each object.
$F_{w}=3200 \mathrm{lb}, v=6 \overline{0} \mathrm{mi} / \mathrm{h}$ (change to $\mathrm{ft} / \mathrm{s}$ )

Prabhu Ramji

Numerade Educator

02:51

(a) Find the momentum of a heavy automobile weighing 5850 lb traveling $70.0 \mathrm{ft} / \mathrm{s}$.
(b) Find the velocity of a light automobile weighing $2580 \mathrm{lb}$ so that it has the same momentum as the heavy automobile.

Prabhu Ramji

Numerade Educator

02:02

Problem 10

(a) Find the momentum of a bullet of mass $1.00 \times 10^{-3}$ slug traveling $70 \overline{0} \mathrm{ft} / \mathrm{s}$.
(b) Find the velocity of a bullet of mass $5.00 \times 10^{-4}$ slug so that it has the same momentum as the bullet in part (a).

Prabhu Ramji

Numerade Educator

02:07

Problem 11

(a) Find the momentum of an automobile of mass $2630 \mathrm{~kg}$ traveling $21.0 \mathrm{~m} / \mathrm{s}$.
(b) Find the velocity (in $\mathrm{km} / \mathrm{h}$ ) of a light auto of mass $1170 \mathrm{~kg}$ so that it has the same momentum as the auto in part (a).

Prabhu Ramji

Numerade Educator

02:02

Problem 12

A ball of mass $0.50 \mathrm{~kg}$ is thrown straight up at $6.0 \mathrm{~m} / \mathrm{s}$. (a) What is the initial momentum of the ball? (b) What is the momentum of the ball at its peak? (c) What is the momentum of the ball as it hits the ground?

Prabhu Ramji

Numerade Educator

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Problem 13

A bullet with mass $60.0 \mathrm{~g}$ is fired with an initial velocity of $575 \mathrm{~m} / \mathrm{s}$ from a gun with mass $4.50 \mathrm{~kg}$. What is the speed of the recoil of the gun?

Susan Hallstrom

Numerade Educator

02:03

Problem 14

A cannon is mounted on a railroad car. The cannon shoots a $1.75-\mathrm{kg}$ ball with a muzzle velocity of $30 \overline{0} \mathrm{~m} / \mathrm{s}$. The cannon and the railroad car together have a mass of $45 \overline{0} \mathrm{~kg}$. If the ball, cannon, and railroad car are initially at rest, what is the recoil velocity of the car and cannon?

Prabhu Ramji

Numerade Educator

01:33

Problem 15

A $125-\mathrm{kg}$ pile driver falls from a height of $10.0 \mathrm{~m}$ to hit a piling. (a) What is its speed as it hits the piling? (b) With what momentum does it hit the piling?

Shahab Ullah

Numerade Educator

06:10

Problem 16

A person is traveling $75.0 \mathrm{~km} / \mathrm{h}$ in an automobile and throws a bottle of mass $0.500 \mathrm{~kg}$ out the window.
(a) With what momentum does the bottle hit a roadway sign? (b) With what momentum does the bottle hit an oncoming automobile traveling $85.0 \mathrm{~km} / \mathrm{h}$ in the opposite direction? (c) With what momentum does the bottle hit an automobile passing and traveling $85.0 \mathrm{~km} / \mathrm{h}$ in the same direction?

Vishal Gupta

Numerade Educator

04:51

Problem 17

A $75.0-\mathrm{g}$ bullet is fired with a muzzle velocity of $46 \overline{0} \mathrm{~m} / \mathrm{s}$ from a gun with mass $3.75 \mathrm{~kg}$ and barrel length of $66.0 \mathrm{~cm}$.
(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.

Prabhu Ramji

Numerade Educator

05:29

Problem 18

A $40.0$ -grain bullet is fired at a muzzle velocity of $1125 \mathrm{ft} / \mathrm{s}$ from a gun weighing $9.90 \mathrm{lb}$ and a barrel length of $21.6$ in. ( 1 grain $=64.8 \mathrm{mg}$ )
(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.

Vishal Gupta

Numerade Educator

03:14

Problem 19

(a) What force is required to stop a $1250-\mathrm{kg}$ car traveling $95.0 \mathrm{~km} / \mathrm{h}$ within $4.00 \mathrm{~s}$ ?
(b) How far does the car travel during its deceleration?

Shahab Ullah

Numerade Educator

05:04

Problem 20

(a) What force is required to slow a $1350-\mathrm{kg}$ car traveling $90.0 \mathrm{~km} / \mathrm{h}$ to $25.0 \mathrm{~km} / \mathrm{h}$ within $4.00 \mathrm{~s}$ ? (b) How far does the car travel during its deceleration? (c) How long does it take for the car to come to a complete stop at this same rate of deceleration?

Vishal Gupta

Numerade Educator

01:26

Problem 21

What force is required to stop a $30 \overline{0} 0$ -kg truck going $35.0 \mathrm{~km} / \mathrm{h}$ within $5.00 \mathrm{~s}$ ?

Shahab Ullah

Numerade Educator

01:37

Problem 22

What force is needed to stop a piece of heavy equipment moving $10.0 \mathrm{~km} / \mathrm{h}$ in $6.00 \mathrm{~s}$ if its mass is $50 \overline{0} 0 \mathrm{~kg}$ ?

Shahab Ullah

Numerade Educator

04:32

Problem 23

A standard $5.0$ -oz baseball is thrown and reaches a batter with a velocity of $85 \mathrm{mi} / \mathrm{h}$ when it is struck with a bat that causes it to reverse direction with a velocity of $95 \mathrm{mi} / \mathrm{h}$. Find (a) the impulse and (b) the force exerted on the baseball if the bat is in contact with the ball for $7.0 \mathrm{~ms}$.

Vishal Gupta

Numerade Educator

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