Momentum Problem: 8.C.3 Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. (a) Which ball has the greater momentum? (b) Which ball has...

Momentum
Problem: 8.C.3
Two balls are moving in the same direction. Ball A has half the mass of ball B, and is moving at twice its speed. (a)
Which ball has the greater momentum? (b) Which ball has greater kinetic energy?
(a)
They have the same momentum

(b)
A's kinetic energy is greate
Problem: 8.1.2
A sport utility vehicle is travelling at a speed of v m/s. If its momentum has a magnitude of 32,800 kg·m/s, what is
the SUV's mass?

32,800
kg
Problem: 8.1.4
At a circus animal training facility, a monkey rides a miniature motorscooter at a speed of 7.0 m/s. The monkey and
scooter together have a mass of m kg. Meanwhile, a chimpanzee on roller skates with a total mass of 44 kg moves at
a speed of 1.5 meters per second. The magnitude of the momentum of the monkey plus scooter is how many times
the magnitude of the momentum of the chimpanzee plus skates?

9.428/m
Problem: 8.2.1
A golden retriever is sitting in a park when it sees a squi
el. The dog starts running, exerting a constant horizontal
force of 89 N against the ground for 3.2 seconds. What is the magnitude of the dog's change in momentum?

284.8
kg·m/s
Problem: 8.3.2
A cue stick applies an average force of 66 N to a stationary 0.17 kg cue ball for 0.0012 s. What is the magnitude of
the impulse on the cue ball?

0.0792
kg·m/s
Problem: 8.3.4
A steel ball with mass 0.347 kg falls onto a hard floor and bounces. Its speed just before hitting the floor is 23.6 m/s
and its speed just after bouncing is 12.7 m/s. (a) What is the magnitude of the impulse of the ball? (b) If the ball is in
contact with the floor for 0.0139 s, what is the magnitude of the average force exerted on the ball by the floor?
(a)
12.596
kg·m/s
(b)
0.175
N
Problem: 8.6.2
A 332 kg mako shark is moving in the positive direction at a constant velocity of 2.30 m/s along the bottom of a sea
when it encounters a lost 19.5 kg scuba tank. Thinking the tank is a meal, it has lunch. Assuming momentum is
conserved in the collision, what is the velocity of the shark immediately after it swallows the tank?

2.172
m/s
Uniform Circular Motion
9.C.4 Does an object moving in uniform circular motion have constant centripetal acceleration?
Yes No

9.2.2 Saturn travels at an average speed of 9.66×103 m/s around the Sun in a roughly circular o
it. Its
distance from the Sun is 1.43×1012 m. How long (in seconds) is a "year" on Saturn?
9.296 x
s
T = 2pi x radius of o
it / v ( on calculating it gives) = 9.296 x 10
8
sec
9.4.1 A runner rounds a circular curve of radius 24.0 m at a constant speed of 5.10 m/s. What is the
magnitude of the runner's centripetal acceleration?
1.0837
m/s2

9.6.1
An astronaut in training rides in a seat that is moved in uniform circular motion by a radial arm 5.90
meters long. If her speed is 15.0 m/s, what is the centripetal force on her in "G's," where one G
equals her weight on the Earth?
4.174
"G's"
Since 1G = mg ( Her weight on earth) hence


9.6.2 A ball with mass 0.48 kg moves at a constant speed. A centripetal force of 23 N acts on the ball,
causing it to move in a circle with radius 1.7 m. What is the speed of the ball?
9.025
m/s
F = mv
2
/ r ( and on calculating it gives) = 9.025 m/s ( So its Co
ect) or we can use 9.0m/s
9.6.3 A bee loaded with pollen flies in a circular path at a constant speed of 3.20 m/s. If the mass of the
ee is 133 mg...