Graded Exam #2
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Liberty University *
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Course
250
Subject
Physics
Date
Jan 9, 2024
Type
Pages
14
Uploaded by SuperUniverseManatee11
PHY250_TW
|
Chapter 6: The Physics of Extended Objects
Question 1
Correct
6.00 points out
of 6.00
Started on
Sunday, January 1, 2023, 6:14 PM
State
Finished
Completed on
Sunday, January 1, 2023, 6:50 PM
Time taken
35 mins 45 secs
Grade 144.00
out of 150.00 (
96
%)
Car 1 of mass 700 kg is slowly moving along at 0
.
500 m /s when it is hit from
behind by car 2 speeding along at 15
.
0 m /s. After collision, car 1 has a new speed
of 8
.
00 m /s in the same direction. Which of the following is the force with which
car 2 must have struck car 1, if the collision lasted for 0
.
932 s? Also, knowing that
conservation of momentum applies to the situation, what is car 2’s speed after the
collision (
v
) if it has a mass of 850 kg?
Select one:
a. F
= 5
.
63 × 10 N
v
= 8
.
82 m /s
b. F
= 5
.
64 × 10 N
v
= 5
.
89 m /s
c. F
= 5
.
64 × 10 N
v
= 8
.
82 m /s
d. F
= 5
.
63 × 10 N
v
= 7
.
50 m /s
2
f
3
2
f
3
2
f
3
2
f
3
2
f
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0
Question 2
Correct
6.00 points out
of 6.00
Question 3
Correct
6.00 points out
of 6.00
Where is the center of mass for the rectangle in the figure?
Select one:
a. In the center of the rectangle
b. Directly between 1 and 4
c. Close to 3
d. Near the bottom between 3 and 4
A truck weighing 1000 N moves at 5
.
89 m /s when it has an elastic collision with
another vehicle. The second vehicle, weighing 981 N, was stationary but free to
move. Which of the following is the final velocity of the first vehicle after the
collision?
Select one:
a.
v
= 0
.
0565 m /s
b.
v
= 0
.
00901 m /s
c.
v
= 0
.
0583 m /s
d.
v
= 0
.
00168 m /s
1
f
1
f
1f
1
f
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Question 4
Correct
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of 6.00
Question 5
Correct
6.00 points out
of 6.00
On game shows, contestants are sometimes asked to spin large wheels. On a
certain show, a contestant grabs the edge of a wheel and spins it from rest to an
angular speed of 1.24 rad/s. If the radius of the wheel is 1.70 m and the contestant
applies a constant force of 62N to the wheel for 0.50 s, what is the moment of
inertia of the wheel?
Assume that the contestant generates a maximum amount of torque.
Select one:
a. 42 N
⋅
m
b. 84 N
⋅
m
c. 110 N
⋅
m
d. 170 N
⋅
m
A truck that weighs 1000 N moves at 5
.
89 m /s when it hits another vehicle in an
elastic collision. The second vehicle, weighing 981 N, was stationary but free to
move. Find the final velocity of the second vehicle after the collision.
Select one:
a. v
= 29
.
2 m /s
b. v
= 5
.
95 m /s
c. v
= 0
.
0583 m /s
d. v
= 58
.
3 m /s
2
2
2
2
2
f
2
f
2
f
2
f
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Question 6
Correct
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of 6.00
Question 7
Correct
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of 6.00
Question 8
Correct
6.00 points out
of 6.00
Which of the following is not
a vector quantity?
Select one:
a. acceleration
b. displacement
c. power
d. weight
Which of the following is a form of Hooke’s law, where F
is a spring force?
Select one:
a. F = −0.5x
b. F = –kx
c. F = −0.5x
d. F = 0.5kx
A car of mass 1365 kg has four 12.5 kg wheels of radius 0.38 m. Suppose that the
car is moving horizontally at a constant speed. Approximately what percentage of
the car's total kinetic energy is accounted for by the kinetic energy of the wheels?
Treat the wheels as uniform disks with Select one:
a. 1 %
b. 4 %
c. 5 %
d. 7 %
s
s
s
s
2
s
2
I
=
M
1
2
R
2
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Question 9
Correct
6.00 points out
of 6.00
Question 10
Correct
6.00 points out
of 6.00
Two identical boxes are moved in equal distances in the horizontal direction. Box A
experiences a constant net force F
applied at an angle θ to the horizontal and box
B
experiences a constant net force of 2
F
applied at an angle of 2θ to the
horizontal. Which of the following is correct?
Select one:
a. More work is done on box A
than on box B
.
b. More work is done on box B
than on box A
.
c. The same amount of work is done on each box.
d. The amount of work done on each box cannot be determined from the data
given.
The distance between the front and rear wheels of a 2280 kg car is 3
.
15 m. The
car’s center of gravity lies in the middle of the car, 1
.
05 m behind the front wheels.
When the car is at rest, what is the ratio of the force exerted by the ground on the
front wheels to that exerted on the rear wheels?
Select one:
a. 3
.
0
b. 0
.
50
c. 0
.
33
d. 2
.
0
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0
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