The mass of the Moon is 7.4 × 1022 kg and its mean radius is 1.75 × 103 km. What is the acceleration due to gravity at the surface of the Moon?
A) 2.8 × 106 m/s2
B) 9.8 m/s2
C) 4.9 m/s2
D) 1.6 m/s2
E) 0.80 m/s2
D
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Simple Pendulum: A spaceship captain lands on an unknown planet. Before venturing forth, he needs to find out the acceleration due to gravity on that planet. All he has available to him is some thin light string, a stopwatch, and a small 2.75-kg metal ball (it was a rough landing). So he lets the ball swing from a 1.5-m length of the string, starting at rest, and measures that it takes 1.9 s for it to swing from the place where he released it to the place where it first stops as it reverses direction. What is the acceleration due to gravity on this planet?
Fill in the blank(s) with the appropriate word(s).
How fast would you have to travel in order to reach a star that is 50 light-years away from Earth when you are 40 years older than you were when you left Earth? One light-year is the distance light travels in one year
A) 0.58c B) 0.68c C) 0.78c D) 0.88c E) 0.96c
An object moving at a relativistic speed past a stationary observer appears to
A. have length expanded and have a slower clock. B. have length contracted and have a slower clock. C. have length expanded and have a faster clock. D. have length contracted and have a faster clock. E. be completely normal.
Two point charges attract each other with an electric force of magnitude F. If one charge is reduced to one-third its original value and the distance between the charges is doubled, what is the resulting magnitude of the electric force between them?
1.1/12 F 2.1/3 F 3.1/6 F 4.3/4 F 5.3/2 F