Q1. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is the time interval required for it to reach a 4.2-rad displacement after starting from rest?

1. 16
2. 18
3. 1.8
4. 2.0
5. 23

Q2. Calculate the linear speed due to the Earth's rotation for a person at the equator of the Earth. The radius of the Earth is 6.40 106 m.

1. 74.0 m/s
2. 465 m/s
3. 73.0 m/s
4. 233 m/s
5. 357 m/s

Q4. A 3.0-m rod is pivoted about its left end. A force of 6.0 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 is at an angle of 30o to the rod and causes a cw torque. What is the net torque about the pivot?

1.  15 N•m
2.  -6.3 N•m
3.  -0.6 N•m
4.  6.3 N•m
5.  0 N•m

Q5. The quantity "moment of inertia" (in terms of the fundamental quantities of mass, length, and time) is equivalent to:

1. ML2T2
2. ML2
3. ML1T2
4. ML
5. ML2

Q6. A gyroscope has a moment of inertia of 0.14 kgm2 and an initial angular speed of 15 rad/s. Friction in the bearings causes its speed to reduce to zero in 30 s. What is the value of the average frictional torque?

1. 3.3 x 10-2 N-m
2. 8.1 x 10-2 N-m
3. 7.0 x 10-2 N-m
4. 6.2 x 10-2 N-m
5. 14 x 10-2 N-m