Angular Momentum: A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ? m2. If he pulls in his arms so his moment of inertia decreases to 1.80 kg ? m2, what will be his new angular speed?
A. 2.25 rad/s
B. 4.60 rad/s
C. 6.25 rad/s
D. 0.81 rad/s
Answer: C
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Self-Inductance: An ideal solenoid has a self-inductance L. If you now double its radius and its length, but do not change the number of coils, what will its self-inductance be?
A. 4L B. 2L C. L D. L/2 E. L/4
The gravitational force between two metal spheres in outer space is 1000 N. How large would this force be if each of the two spheres had twice the mass?
A. 1000 N B. 2000 N C. 4000 N D. 16,000 N
The Milky Way is similar in many ways to M31, the Andromeda Galaxy
Indicate whether the statement is true or false
An electric generator
A) can create enough energy to light cities. B) can convert mechanical energy to electric energy. C) needs no energy source. D) all the above E) none of the above