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PFTYS
180 Spring2010
Final Examination May 3,2010
Name
Total score
/2A0
For problems marked OSE, using Official Starting Equations
for fullcredit.
MULTIPLE CHOICE SECTION: answer on Scantron
sheet
(1) (4 points) What do you think about starting off an exam with a very easy question?
(A) I
think it's great!
(B) I'm philosophically
opposed
to it; all points must be earned
(C) I'll take
the
points any way I can get them. (D) An easy question
can put me offmy guard
(E) What? (Any
answers
count as correct).
(2) (12 points) You can exert a force on a block of mass M in one of two ways: you can exert
EITHER a force of 2000 N acting
for a time of 0.01 s, OR a force of 200 N acting
for a time of
0.1 s. These
two alternatives
would produce.
..
(A) the same acceleration of the block (while the force
is operating)
(B) the same
rate of change of momentum of the block (while the force
is o
the same change in momentum
momenfum afterwards minus momenfum
(D) the same rate of change in kinetic energ/ of the block (while the force is operating)
(E) none of the above.
(3) (12 points) A rock is dropped
from rest and accelerates
downward with acceleration
whose
magnitude
is g
:
l0 m/s2. Now suppose
that instead of being dropped
from rest, the rock is
thrown downward with initial speed 10 m/s . Immediately aft"Llh9]g*M&ft
your hand, what
is the magnitude of the acceleration?
(lrleglect air resistance)((A) g
:
10 m/s2l@) about 2A m/s2
(C) less
than g (D) more than g but less
than 20 m/s2 (E) zero
(4) (I2 points) A man starts to push on a crate on a rough floor. The crate is initially at rest, but
starts
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 Spring '10
 Farley

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