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PARTIAL CREDIT
will be given so do what you can and make sure that you show all work for
each problem.
No credit will be given if no work is shown
.
The point value of each question
is indicated.
1.
A rock dropped from a cliff falls onethird of its total distance to the ground in the last
second of its fall.
Determine the height of the cliff. (10 pts)
2.
A train pulls away from a station with a constant acceleration of 0.4 m/s
2
.
A passenger
arrives at the track 6.0 s after the end of the train has passed the very same point. What
is the slowest constant speed at which she can run and catch the train? (10 pts)
3.
Suppose that the clock on our lecture room has a minutehand length of 5.0 cm.
(Use a coordinate system with the origin at center of clock and +x axis along the 3PM
direction and the +y direction along the 12PM direction)
(15pts)
a)
Calculate the displacement of the tip of the minute hand from the 3 PM mark to
the 8 PM mark. Label the vectors on clock diagram.
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 Spring '11
 Luna
 Physics, Work

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