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101Fa15Exam1VersionA.pdf
101Fa15Exam1VersionA.pdf
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101Fa15Exam1VersionA.pdf-Physics 101 Hour Exam 1 O...
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Page 6
8)
9)
10)
The next three questions pertain to the situation described below
.
A 12 kg mass hangs by a string from the ceiling of an elevator. The elevator is moving down with a
constant velocity of 24 m/s.
Find the tension, T, in the string:
a.
406 N
b.
118 N
c.
142 N
The elevator begins to slow down at 3 m/s
2
. Find the tension during the deceleration.
a.
154 N
b.
615 N
c.
354 N
If the elevator cable was to break and the elevator was to fall freely, the tension in the string
holding the mass would become zero
a. False
b. True
Page 4 of 9
Page 7
11)
12)
13)
The next three questions pertain to the situation described below
.
A ball is thrown vertically upward from the ground with a speed of 24.4 m/s
How long does it take to reach the highest point?
a.
2 s
b.
2.5 s
c.
3 s
d.
1 s
e.
1.6 s
How high does the ball rise?
a.
61 m
b.
1.24 m
c.
30.38 m
The ball’s height at 2 s is
a.
29.2 m
b.
20.1 m
c.
35.6 m
Page 5 of 9
Page 8
14)
15)
16)
17)
A horse pulls a box of mass M = 55 kg across a rough horizontal surface by applying a horizontal
force of 874 N. If the coefficient of kinetic friction between the box and the surface is
μ
k
= 0.5,
what is the acceleration of the box?
a.
6 m/s
2
b.
3 m/s
2
c.
11 m/s
2
d.
18 m/s
2
e.
12 m/s
2
An object is dropped from rest at a height h and strikes the ground with velocity v. If the object is
instead dropped from rest at a height of 2h, which of the following represents its velocity when it
strikes the ground?
a.
1.4 v
b.
4 v
c. v
d.
8 v
e.
2 v
A projectile is fired with an initial speed of 200 m/s. If it reaches its maximum height after 10 s,
at what angle relative to the horizontal was it fired?
a. 90.8°
b. 29.3°
c. 60.3°
d. 45.7°
e. 20.4°
The radius of an object rotating in a circle is quadrupled, while the applied centripetal force
remains constant. The speed of the object:
a.
decreases by a factor of 2.
b.
does not change.
c.
increases by a factor of 2.
d.
decreases by a factor of 4.
e.
increases by a factor of 4.
Page 6 of 9
Page 9
18)
19)
20)
A boy uses a string to swing a
2.2 kg
stone around his head. The string is
1.5 m
long, and can
bear a maximum tension of
1012 N
. What is the maximum speed at which the boy can swing the
stone without breaking the string?
a.
v = 26.3 m/s
b.
v = 15.78 m/s
c.
v = 42.08 m/s
The next two questions pertain to the situation described below.
A bicycle wheel of radius r = 2.5 m is spinning about its own axis. It accelerates uniformly from rest
at a rate of
α
= 0.25 rad/s
2
and spins a total of 450 radians.
How long does it take to spin 450 radians?
a.
10 s
b.
45 s
c.
60 s
What is the wheel’s final angular velocity?
a.
7.5 rad/s
b.
15 rad/s
c.
3.75 rad/s
Page 7 of 9
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