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Phy 121 Midterm 1.
October 5, 2010
Exam form 0
1
This is a closed book exam.
Use your own formula sheet, 8½ x 11 inches, double sided,
handwritten.
You may only use your own calculator; NO SHARING.
ANY
manipulation of
electronic equipment (IPod, cell phone, laptop computer, pager, etc.) other than your calculator
is strictly prohibited, and will result in a zero on this exam.
Answer all problems on the bubble
scan sheet.
Before you start,
enter your name and student ID number on the
answer sheet
.
This is exam form 0.
Mark 0 on the first digit of
birth day on the bubble scan sheet
.
(Do not fill in your birth date.)
There are twenty questions, each of which carries equal weight.
1.
A car traveling with constant acceleration is at 3
s
at 1
m
and at 9 s at 10
m
as shown.
What is the average velocity for this
time interval ?
A.
0.66
m/
s
B.
1.0
m/
s
C.
1.5
m/
s
D.
0.5
m/
s
E.
3.0
m/
s
2.
In the graph shown the object is at 2 s at 3
m
. The object is
at 6 s at
A.
29.7
m
B.
32.1
m
C.
36.7
m
D. 48.3
m
E. 25.3
m
3.
The position
x
of an object as a function of time is given as
3
4 3
5
tt
. All
units are understood to be S.I.
.
The initial time = 0. The direction of the positive
xaxis is “forward”. The correct statement is:
A. The motion is forward for all times.
B. The acceleration is constant in time.
C. The initial velocity is 5
m/s
.
D. The initial motion is backward.
E. The corresponding equation for the velocity is
3
10
t
.
4.
An astronaut on the moon (vacuum) made the following experiment. He dropped
simultaneously a feather and a 1 kg rock from the same height. The following
statements are correct (Use for the ratio of the gravitational acceleration at the surface
of the moon over the corresponding value on earth
/
1/ 6
moon
earth
gg
) :
A. The fall time of the rock from the same height was
6 times its value on earth.
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 Fall '08
 STEPHENS

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