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Practice
PY211 MIDTERM EXAM 2
Useful Numbers:
G = 6.67 x 10
11
Nm
2
/kg
2
g = 9.8 m/s
2
R
Earth
= 6.38 x 10
3
km
M
Earth
= 5.97 x 10
24
kg
R
Moon
= 1.74 x 10
3
km
M
Moon
= 7.35 x 10
22
kg
EarthMoon Distance = 384 x 10
3
km
1.
Write your answer in the space provided (2 points each including bonus points).
_____
Two objects, a spherical ball with mass
M
and rectangular block with mass
3M
, start from
rest on top of a hill.
The spherical ball rolls down the hill without slipping.
The
rectangular block slides down the hill without friction.
Which has the higher linear
velocity of its centerofmass at the bottom of the hill?
A)
Both have the same velocity
B)
The rolling ball
C)
The rectangular block
D)
Not enough information
_____
Compare a ball bouncing elastically off of a wall to a piece of putty of the same mass and
initial velocity hitting the wall and sticking to it.
In which case is the
impulse
to the wall
the largest?
A)
The putty hitting the wall
B)
The ball hitting the wall
C)
They give the same impulse to the wall
D)
Not enough information is given
_____
A figure skater stands on one spot of the ice and spins with her arms extended.
As she
pulls her arms in close to her body, her angular velocity changes.
Compared to having her
arms extended outwards, with arms pulled in, her angular momentum
:
A)
Remains unchanged
B)
Decreases
C)
Increases
D)
Equals zero
E)
Not enough information
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I build a children’s slide to be
3 m
high.
I can build the slide so that it is either straight or
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 Spring '08
 Stone

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