Which of the following statements best describes one astronomical unit (AU)?
A) It is the distance from Earth to the Moon.
B) It is equal to the average distance of the Sun from Earth.
C) It is the distance that light travels in a vacuum in one year.
D) It is the average distance between two stars in the Milky Way.
B
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On the earth, when an astronaut throws a 0.250-kg stone vertically upward, it returns to his hand a time T later. On planet X he finds that, under the same circumstances, the stone returns to his hand in 2T
In both cases, he throws the stone with the same initial velocity and it feels negligible air resistance. The acceleration due to gravity on planet X (in terms of g) is A) g/4. B) g/2. C) g/ . D) g . E) 2g.
A coin and a ring roll down an incline at the same time. The one to first reach the bottom is the
A) ring. B) coin. C) both reach the bottom at the same time
Reverberation of sound occurs for
A) sound interference. B) forced vibrations. C) re-echoed sound. D) resonance. E) none of the above
If kerosene costs 130. Passi per liter, and one dollar buys 227. Passi; what is its cost in DOLLARS per GALLON? [1.00 gallon = 3.79 liters]
What will be an ideal response?