77777
77777
Instructor(s):
Mueller/Saab
PHYSICS DEPARTMENT
PHY 2048
Exam 2
October 26, 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)
Hand in the answer sheet separately.
Where needed use
g
= 9
.
80 m/s
2
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77777
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1. The weight of an object on the moon is onesixth of its weight on Earth. The ratio of the kinetic energy of a body on
Earth moving with speed V to that of the same body moving with speed V on the moon is:
(1) 1:1
(2) 6:1
(3) 36:1
(4) 1:6
(5) 1:36
2. An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s. The work done on
the object during one revolution is:
(1) 0
(2) 1 J
(3) 2 J
(4) 4 J
(5) 16 J
3. At time
t
= 0 a particle starts moving along the x axis. If its kinetic energy increases uniformly with time,
t
, the net
force acting on it must be:
(1) proportional to 1
/
√
t
(2) constant
(3) proportional to
t
(4) inversely proportional to
t
(5) proportional to
√
t
4. An ideal spring, with a pointer attached to its end, hangs next to a linear
scale. With a 100N weight attached, the pointer indicates “40” on the scale
as shown. Using a 200N weight instead results in “60” on the scale. Using
an unknown weight W instead results in “30” on the scale. The weight of
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 Summer '08
 Field
 Physics, Energy, Force, Kinetic Energy, Mass, Potential Energy

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