The moons of Mars are
A. too small to pull themselves round.
B. Phobos and Deimos.
C. captured asteroids.
D. All of these choices are correct.
Answer: D
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Distinguish between the concepts of velocity and acceleration, using a bowling ball's behavior as an example for each
What will be an ideal response?
The figure shows two point sources of light, A and B, that emit light waves in phase with each other. A is a distance of 3? from point P. B is distant 5? from P. (? is the wavelength.) The phase difference between the waves arriving at P from A and B is
?
?
a.
0 rad.
b.
? rad.
c.
2? rad.
d.
3? rad.
e.
4? rad.
One way that future space stations may create artificial gravity is by rotating the station. Consider a cylindrical space station 380 m in diameter that is rotating about its longitudinal axis
Astronauts walk on the inside surface of the space station. How long will it take for each rotation of the cylinder if it is to provide "normal" gravity for the astronauts? A) 6.2 s B) 28 s C) 4.4 s D) 39 s
You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A) your watch slowing down. B) your watch speeding up. C) your watch losing time. D) your watch gaining time. E) nothing unusual about the behavior of your watch.