Which of the following stars would exhibit the largest amount of stellar parallax?
A) the star that is nearest to us
B) the star that is farthest from us
C) the star that is brightest in our sky
D) the star that is dimmest in our sky
E) the star that is moving at the highest speed relative to Earth
A) the star that is nearest to us
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In order to train for a high-g environment, an astronaut is placed in a centrifuge of radius several meters and rotated in a horizontal circle at constant speed. In this situation, in which direction is the net force on the astronaut?
a. The net force is down since gravity cannot be turned off. b. The net force is horizontal toward the center of the circle. c. The net force is between horizontal toward the center of the circle and straight up, the angle depending on the speed and the radius involved. d. The net force is zero since the astronaut is moving at constant speed and thus the force has no direction.
Why don't we see very many low-mass exoplanets?
What will be an ideal response?
A change in a physical quantity w having initial value wi and final value wf is given by which of the following?
a. wi - wf c. (wf + wi)/2 b. wf - wi d. none of the above
In order for two objects to have the same temperature, they must
A. be in thermal equilibrium. B. be in thermal contact with each other. C. have the same relative "hotness" or "coldness" when touched. D. have all of the properties listed above. E. have only properties (b) and (c) above.