Seat: ___________________
PERM #: _____________________________
PHYSICS 6AEXAM I –
VERSION A
1. (5 points) The following conversion equivalents are given:
1 gal = 231 in
3
1 ft = 12 in
1 min = 60 s
A pipe delivers water at the rate of 71 gal/min.
The rate in ft
3
/s, is closest to:
A) 0.12
B) 0.10
C) 0.16
D) 0.14
E) 0.13
Answer: C
2. (7 points) The components of vectors
and
are given as follows:
A
x
= +9
B
x
=
4.4
A
y
=
6.5
B
y
=
4.3
The magnitude of the vector difference

, is closest to:
A) 180
B) 5.1
C) 12
D) 14
E) 4.9
Answer: D
3. (7 points) A ball is projected upward at time t = 0.0 s, from a point on a roof 60 m
above the ground. The ball rises, then falls and strikes the ground. The initial velocity of
the ball is 23.4 m/s. Consider all quantities as positive in the upward direction. At time t
= 2.39 s, the velocity of the ball is closest to:
A) 0 m/s
B) +28 m/s
C) +12 m/s
D) 28 m/s
E) 12 m/s
Answer: A
4. (5 points) An object is dropped from rest into a pit, and accelerates due to gravity at
roughly 10 m/s
2
. It hits the ground in 5 seconds. A rock is then dropped from rest into a
second pit, and hits the ground in 10 seconds. How much deeper is the second pit,
compared to the first pit? Neglect air resistance.
A) three times deeper
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 Fall '07
 STANEK
 Physics, Acceleration, Velocity, m/s, 29 m/s, 37 m/s

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