A spaceship approaching an asteroid at a speed of 0.6 c launches a scout rocket with speed 0.4 c. At what speed is the scout rocket approaching the asteroid?
A) 0.81 c
B) 1.00 c
C) 0.76 c
D) 0.64 c
E) 0.96 c
A
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Given the distance x that a spring is compressed, what is the potential energy of the spring?
A. 2 kx^2 B. ½ kx C. ½ kx^2 D. 2 kx
Suppose you find an X-ray binary that exhibits X-ray bursts. Is it possible that the system's X-ray binary consists of a red giant and a black hole? Why or why not?
What will be an ideal response?
If an astronaut with a weight of 800 N on Earth steps on a bathroom scale while he is in Earth orbit, the scale will read
A. zero. B. less than 800 N. C. 800 N. D. more than 800 N.
What is the weak force?
a. Another name for the nuclear force (i.e., the n-n, n-p, p-p) force. b. The gravitational force at the nuclear level. c. A nuclear force much weaker than gravitational forces. d. The force involved in beta decay. e. The force holding electrons to nuclei.