A uniform rod (mass = 1.5 kg) is 2.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest in a horizontal position. What is the angular speed of the rod when the rod makes an angle of 30° with the horizontal? (The rotational inertia of the rod about the pin is 2.0 kg?m2).
A. 2.2 rad/s
B. 3.6 rad/s
C. 2.7 rad/s
D. 3.1 rad/s
E. 1.8 rad/s
Answer: C
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Fill in the blank(s) with the appropriate word(s).
A board of mass m lies on the ground. What is the magnitude of the force you would have to exert to lift one end of the board barely off the ground (assuming that the other end still touches the ground)?
A. 
B. 
C. 
D. The answer depends on the board’s length.
E. Other (explain)
Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth. Compared to the twin who remained on Earth, the astronaut twin is
A) younger than the Earth-twin. B) the same age as the Earth-twin. C) older than the Earth-twin. D) The ages cannot be determined from the information provided.
Add the following lengths, each obtained from a different measuring instrument, and round the answer to the proper number of significant figures: 20.02 m, 5.91 m, 0.0097 m, and 2.467 m
What will be an ideal response?