Phys 151
Midterm Exam A
Name:
Signature:
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Sect:
Write your answer in the space provided before each question number
.
Wherever needed, assume that g = 10 m/s
2
or 32 ft/ s
2
.
[
] 1. The following is a strobelike illustration of a moving bug traveling in a straight line. The interval in which it
had increasing speed followed by decreasing speed is ……., the interval in which it appears uniformly
accelerating
is
…….and the interval in which it covered the least distance is …….
a
b
c
d
A) a …b….d
B)
a.…d….b
C) b….a….c
D) c….b….b
E)
b….d….b
F) none of the previous
[
] 2. From the figure above, which shows the acceleration
vs. time plot of the straightline motion of an object,
where is it moving fastest
? (Assume initial speed of zero.)
A) at A
B) at D
C) at C
D) along BC
E) along CD
F) along OA
G) none of the previous
[
] 3. Where is the object (in the previous figure) furthest
from its starting point
?
A) along OA
B) along AB
C) along BC
D) along CD
E) at A
F) at B
G) at C
H) at D
[
] 4. A tourist is being chased by a bear. He runs in a straight line toward his car at a speed of 4.0 m/s. The bear is
26 m behind the tourist and can run at 6.0 m/s. Up to how far can the car be for the tourist to reach it safely?
A) 26 m
B) 13 m
C) 39 m
D. 52 m
E. none of the previous.
[
] 5. A ball is shot and moves up a curved ramp from B to A as shown. During its total motion along the ramp, the
magnitude
of its acceleration
A) increases
B) decreases
C) remains unchanged
D) increases, then decreases
E) decreases, then increases
[
] 6. A rescue helicopter is flying vertically upwards
at a constant
speed of 5 m/s over open water. While the
helicopter is still moving, a crewman throws a raft downwards
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 Winter '10
 LIM
 Force, m/s, Miles per hour, constant speed, parked car

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