c.
1.3 m/s
Two masses
m
1
and
m
2
, with
m
1
>
m
2
, have momenta with equal magnitudes. How do their kinetic energies
compare?

c.
KE
1
<
KE
2
A model car is propelled by a cylinder of carbon dioxide gas. The cylinder emits gas at a rate
of 4.5 g/s with an exit speed of 80.0 m/s. The car has a mass of 200 g, including the
CO
2
cylinder. Starting from rest, what is the car's initial acceleration?
c.
1.8 m/s
2
A wheel is rotated about a horizontal axle at a constant angular speed. Next it is rotated in
the opposite direction with the same angular speed. The acceleration at a point on the top
of the wheel in the second case as compared to the acceleration in the first case:
b.
is in the same direction.
A 2000-kg ore car rolls 50.0 m down a frictionless 10.0
°
incline. If there is a horizontal spring
at the end of the incline, what spring constant is required to stop the ore car in a distance of
2.00 m?
a.
1700 kN/m
Which of the following is that form of energy associated with an object's location in a conservative force
field?
c.
potential
A billiard ball (Ball #1) moving at 6.00
m/s strikes a stationary ball (Ball #2) of the same
mass. After the collision, Ball #1 moves at a speed of 5.25
m/s. Find the speed of Ball #2
after the collision.
d.
0.75
m/s
A point on the rim of a 0.15-m-radius rotating disk has a centripetal acceleration of 5.0 m/s
2
.
What is the angular speed of a point 0.075 m from the center of the disk?
b.
5.8 rad/s
A 5-kg object is moving to the right at 4 m/s and collides with a 4-kg object moving to the
left at 5 m/s. The objects collide and stick together. After the collision, the combined object:
.
has no kinetic energy.
The acceleration due to gravity at the surface of Planet X is 10 m/s
2
. What is the acceleration
due to gravity at an altitude of 4000 km above the surface of this planet?
d. More information is needed.
At what location does an artificial Earth satellite in elliptical orbit have its lowest speed?
c.
farthest from the Earth
-ANDIE15

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