Y2012SP-PHYS105-Practice Exam 3 - UIC Physics 105 Midterm...

UIC PHYSICS 105 Spring 2012 Practice Exam 3
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UIC Physics 105
Midterm Practice Exam 3
Best if used by April 30, 2012
(2 Hours)
PROBLEM POINTS SCORE
Multiple
Choice
30
Short
Problem 1
10
Short
Problem 2
10
Short
Problem 3
10
Short
Problem 4
10
Short
Problem 5
10
Long
Problem
20
Total 100

UIC PHYSICS 105 Spring 2012 Practice Exam 3
Page 2 of 7
MULTIPLE CHOICE
(3 points each)
Clearly circle the letter of the best answer. No points are deducted for incorrect answers.
MC1: If Martian Orbiter I is sailing around the planet in a circle which has an orbital radius nine times
that of Martian Orbiter II, who’s speed is v
2
, what is the speed of Martian Orbiter I?
(A) v
1
=
(1/9) v
2
(B) v
1
=
(1/3) v
2
(C) v
1
=
v
2
(D) v
1
=
3 v
2
MC2: A satellite moves around the Earth in a circular orbit of radius r with speed v
0
. Suddenly, an
explosion breaks the satellite into two pieces, with masses m and 4 m . Immediately after the explosion
the smaller piece of mass m is stationary with respect to the Earth and falls directly toward the Earth.
The speed v
4 m
of the larger piece immediately after explosion is:
(A) v
4 m
=
(1/4) v
0
(B) v
4 m
=
v
0
(C) v
4 m
=
(5/4) v
0
(D) v
4 m
=
5 v
0
.
MC3: A mass m = 450 g oscillates from a vertically hanging light spring with a period of 0.55 s. It
started by being compressed 10 cm from the equilibrium position (where y = 0) and released. How
long will it take to get to the equilibrium position for the first time?
(A) 0.14 s
(B) About 0.28 s (one-half period)
(C) 0.55 s
(D) The mass will never reach equilibrium.
MC4: A damped harmonic oscillator involves a block of mass m = 2 kg, a spring with k = 10 N/m, and
a damping force with damping constant b = 0.1 kg/s. Initially it oscillates with amplitude of 20 cm.