Exam II
1)
A 500kg object, initially at rest, is accelerated by a horizontal force of 150.0N for a time
of 8.00 seconds.
a.
Calculate the resulting acceleration
b.
Calculate the object’s kinetic energy at 8.00s from the start
c.
Calculate the work done in 8.00s
d.
Calculate the average power delivered to the object in the 8.00s
e.
Calculate the instantaneous power at 8.00s
2)
A block, initially at rest, slides down a smooth ramp inclined at 30 degrees. When a
material is applied to the ramp to produce friction, the block slides down the ramp in
twice the time. Calculate the coefficient of friction of the material that was applied to the
ramp.
3)
45.0kg woman is standing on a scale that expresses her weight in Newton’s. Since it is a
spring scale, it will measure her apparent weight. On the way down
the elevator slows
uniformly
from 8.00 m/s to rest in 5.00 seconds. What will be the scale’s reading (in
Newton’s) while coming to rest?
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 Spring '08
 rollino
 Physics, Acceleration, Energy, Force, Kinetic Energy, Mass, Work

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