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77777
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Instructor(s):
Profs. D. Reitze, H. Chan
PHYSICS DEPARTMENT
PHY 2053
Exam 1
February 17, 2009
Name (print, last ﬁrst):
Signature:
On my honor, I have neither given nor received unauthorized aid on this examination.
YOUR TEST NUMBER IS THE 5DIGIT NUMBER AT THE TOP OF EACH PAGE.
(1)
Code your test number on your answer sheet (use lines 76–80 on the answer sheet for the 5digit number)
.
Code your name on your answer sheet.
DARKEN CIRCLES COMPLETELY
. Code your UFID number on your
answer sheet.
(2) Print your name on this sheet and sign it also.
(3) Do all scratch work anywhere on this exam that you like.
Circle your answers on the test form.
At the end of the
test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout.
(4)
Blacken the circle of your intended answer completely, using a #2 pencil or blue
or black
ink
. Do not
make any stray marks or some answers may be counted as incorrect.
(5) The answers are rounded oﬀ. Choose the closest to exact. There is no penalty for guessing.
(6)
Hand in the answer sheet separately.
Constants:
G
= 6
.
67
×
10

11
N m
2
/kg
2
g
= 9
.
80 m/s
2
1. Which of the following objects have constant velocity?
(1) A particle traveling along a straight line with no acceleration.
(2) A particle traveling with constant speed around a circle.
(3) A particle in free fall.
(4) A particle thrown at 45 degrees to the horizontal.
(5) A particle on a frictionless inclined plane.
2. The acceleration due to gravity on the surface of a planet is 1,000 miles/hour
2
. Find the value of the acceleration in S.I.
units. (1 mile = 1609 meters)
(1) 0.124 m/s
2
(2) 447 m/s
2
(3) 2240 m/s
2
(4) 8,060,000 m/s
2
(5) 9.80 m/s
3. The acceleration due to gravity on the surface of a planet is 500 miles/hour
2
. Find the value of the acceleration in S.I.
units. (1 mile = 1609 meters)
(1) 0.0621 m/s
2
(2) 224 m/s
2
(3) 1120 m/s
2
(4) 4,030,000 m/s
2
(5) 9.80 m/s
4. The acceleration due to gravity on the surface of a planet is 2,000 miles/hour
2
. Find the value of the acceleration in S.I.
units. (1 mile = 1609 meters)
(1) 0.248 m/s
2
(2) 894 m/s
2
(3) 4480 m/s
2
(4) 16,100,000 m/s
2
(5) 9.8 m/s
5. A particle passes a point with speed 10.0 m/s. After 10.0 s, it returns to the starting point with the same speed but
with direction reversed. Find the magnitude of the average acceleration.
(1) 2.00 m/s
2
(2) 1.00 m/s
2
(3) 4.00 m/s
2
(4)

2
.
00 m/s
2
(5) 0 m/s
2
6. A particle passes a point with speed 20.0 m/s. After 20.0 s, it returns to the starting point with the same speed but
with direction reversed. Find the magnitude of the average acceleration.
(1) 2.00 m/s
2
(2) 1.00 m/s
2
(3) 4.00 m/s
2
(4)

2
.
00 m/s
2
(5) 0 m/s
2
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7. A particle passes a point with speed 20.0 m/s. After 10.0 s, it returns to the starting point with the same speed but
with direction reversed. Find the magnitude of the average acceleration.
(1) 4.00 m/s
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