An automobile accelerates from zero to 24 m/s in 6 s. The wheels have a diameter of 2 m. What is the
average angular acceleration of each wheel?
Select one:
a. 3 rad/s2
b. 2 rad/s2
c. 8 rad/s2
d. 4 rad/s2
e. 12 rad/s2
A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance
of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m
from the pivot. The 5.2-N force is at an angle of 30o to the rod and causes a cw torque. What is the net
torque about the pivot? (Take ccw as positive.)
Select one:
a. 4.2 N·m
b. −4.2 N·m
c. −18 N·m
d. 18 N·m
Check
A 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a
constant 4.0 rad/s2 over a 3.0-s interval?
Select one:
a. 5.4 rad
b. 18 rad
c. 40 rad
d. 36 rad
e. 10.8 rad
A grindstone spinning at the rate of 20 rev/s has what approximate angular speed?
Select one:
a. 63 rad/s
b. 40 rad/s
c. 126 rad/s
d. 6.4 rad/s
e. 31 rad/s
,A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2. What is the time interval
required for it to reach a 10-rad displacement after starting from rest?
Select one:
a. 2.0 s
b. 56 s
c. 18 s
d. 28 s
Correct
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The correct answer is: 28 s
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Question 2
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A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is
the average tangential acceleration of a point on the wheel's edge?
Select one:
a. 14 m/s2
b. 28 m/s2
,c. 0.60 m/s2
Correct
d. 0.45 m/s2
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The correct answer is: 0.60 m/s2
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Question 3
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A bank vault is opened by applying a force of 300 N perpendicular to the plane of the door, 1.2 m from
the hinges. Find the torque due to this force about an axis through the hinges.
Select one:
a. 300 N·m
b. 660 N·m
c. 360 N·m
Correct
d. 330 N·m
e. 250 N·m
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, The correct answer is: 360 N·m
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Question 4
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The torque caused by a force F applied at a distance r from the axis of rotation, is given by τ = rF
sinθ, where θ is the angle between and . If the magnitudes r and F remain the same, what
other angle θ' will produce the same torque as was produced at angle θ if θ was less than 90°?
Select one:
a. θ' = 90° - θ
b. None of the above.
c. θ' = 90° + θ
d. θ' = 180° - θ
Correct
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The correct answer is: θ' = 180° - θ
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average angular acceleration of each wheel?
Select one:
a. 3 rad/s2
b. 2 rad/s2
c. 8 rad/s2
d. 4 rad/s2
e. 12 rad/s2
A 3.0-m rod is pivoted about its left end. A force of 10 N is applied perpendicular to the rod at a distance
of 1.2 m from the pivot causing a ccw torque, and a force of 5.2 N is applied at the end of the rod 3.0 m
from the pivot. The 5.2-N force is at an angle of 30o to the rod and causes a cw torque. What is the net
torque about the pivot? (Take ccw as positive.)
Select one:
a. 4.2 N·m
b. −4.2 N·m
c. −18 N·m
d. 18 N·m
Check
A 0.30-m radius automobile tire rotates how many rad after starting from rest and accelerating at a
constant 4.0 rad/s2 over a 3.0-s interval?
Select one:
a. 5.4 rad
b. 18 rad
c. 40 rad
d. 36 rad
e. 10.8 rad
A grindstone spinning at the rate of 20 rev/s has what approximate angular speed?
Select one:
a. 63 rad/s
b. 40 rad/s
c. 126 rad/s
d. 6.4 rad/s
e. 31 rad/s
,A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2. What is the time interval
required for it to reach a 10-rad displacement after starting from rest?
Select one:
a. 2.0 s
b. 56 s
c. 18 s
d. 28 s
Correct
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The correct answer is: 28 s
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2 21/08/17, 12:07 Saved: 28 s Answ
3 21/08/17, 12:07 Attempt finished Corr
Question 2
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Question text
A 0.20-m radius grinding wheel starts at rest and develops an angular speed of 12.0 rad/s in 4.0 s. What is
the average tangential acceleration of a point on the wheel's edge?
Select one:
a. 14 m/s2
b. 28 m/s2
,c. 0.60 m/s2
Correct
d. 0.45 m/s2
Feedback
The correct answer is: 0.60 m/s2
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Question 3
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Question text
A bank vault is opened by applying a force of 300 N perpendicular to the plane of the door, 1.2 m from
the hinges. Find the torque due to this force about an axis through the hinges.
Select one:
a. 300 N·m
b. 660 N·m
c. 360 N·m
Correct
d. 330 N·m
e. 250 N·m
Feedback
, The correct answer is: 360 N·m
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Step Time Action State
1 21/08/17, 12:06 Started Not y
2 21/08/17, 12:07 Saved: 360 N·m Answ
3 21/08/17, 12:07 Attempt finished Corr
Question 4
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Question text
The torque caused by a force F applied at a distance r from the axis of rotation, is given by τ = rF
sinθ, where θ is the angle between and . If the magnitudes r and F remain the same, what
other angle θ' will produce the same torque as was produced at angle θ if θ was less than 90°?
Select one:
a. θ' = 90° - θ
b. None of the above.
c. θ' = 90° + θ
d. θ' = 180° - θ
Correct
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The correct answer is: θ' = 180° - θ
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