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- 1. Multiple ChoiceA person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms,her moment of inertia increases and her angular speed decreases.her moment of inertia decreases and her angular speed increases.her moment of inertia increases and her angular speed increases.her moment of inertia increases and her angular speed remains the same.
- 2. Multiple ChoiceA merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say thatthe moment of inertia of the system increases and the angular speed increases.the moment of inertia of the system decreases and the angular speed remains the same.the moment of inertia of the system decreases and the angular speed decreases.the moment of inertia of the system decreases and the angular speed increases.
- 3. Multiple Choice
A uniform solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 33.4 rpm. What is its kinetic energy? (Hint: I=1/2 MR2)
0.092 J
17 J
1.1 J
0.18 J
- 4. Multiple Choice
Which of these gives rotational kinetic energy?ab - 5. Multiple ChoiceWhat does this formula measure?moment of inertiaimpulseelectric currentangular momentum
- 6. Multiple ChoiceAccording to the Law of Conservation of Angular Momentum, if I (momentum of inertia) increases, what will happen to ω?DecreaseStay the sameIncrease
- 7. Multiple ChoiceTwo children, Ahmed and Saleh, ride on a merry-go-round. Ahmed is at a greater distance from the axis of rotation than Saleh. Which of the following are true statements?Saleh and Ahmed have the same tangential speed.Ahmed has a greater tangential speed than Saleh.Saleh has a greater angular speed than Ahmed.Saleh has a smaller angular speed than Ahmed.
- 8. Multiple Choice
When submitted to a net torque of 6.2 Nm, the
wheel of a scooter increases its angular speed from 1.4 rad/s to 4.7 rad/s in 4.5 s. What is the rotational inertia of the wheel?
2.2 N.m2
3.8 N.m2
4.5 N.m2
8.5 N.m2
- 9. Multiple Choice
The angular momentum of an object changes from 9.0 𝑘𝑔𝑚!/𝑠 to 6.0 𝑘𝑔𝑚!/𝑠 in 10 s. What is the torque causing the change?
0.3 Nm
1.3Nm
2.5Nm
4.1Nm
- 10. Multiple Choice
A windmill has an initial angular momentum 𝑜𝑓 8500 𝑘𝑔𝑚!/𝑠. The wind picks up, and 5.86 𝑠 later the windmill’s angular momentum is 9700 𝑘𝑔𝑚!/𝑠. What was the torque acting on the windmill, assuming it was constant during this time?
100 N.m
200 N.m
250 N.m
280 N.m
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