A 200-kg spacecraft is launched to the Moon. While in orbit around the Moon, its weight is ________.
A. zero
B. 200 kg
C. about 1/6 its weight on Earth
D. The answer depends on how close to the Moon the ship is orbiting.
Answer: A
You might also like to view...
Why do scientists think tiny quantum ripples should have been present in the very early universe?
A) The shock wave of the Big Bang caused ripples that expanded outward with time. B) The energy released when the strong force froze out of the GUT force caused shock waves that produced ripples in the universe. C) Matter and antimatter particles that spontaneously formed from high-energy photons caused disruptions in the radiation field. D) The annihilation of matter and antimatter particles caused tiny explosions that disrupted the radiation field. E) Quantum mechanics tells us that the energy fields at any point in space be continually fluctuating as a result of the uncertainty principle.
Which Big Bang "puzzles" does the inflationary model resolve?
A. The cosmic background radiation is smooth, but the distribution of matter in the Universe is lumpy. B. The energy of expansion is almost exactly equal to the collective gravitational force between galaxies. C. The Universe is all ordinary matter with almost no antimatter. D. All of these choices are correct.
Intensity: Why does the intensity of waves from a small source decrease with the square of the distance from the source?
A. The waves run out of energy as they travel. B. The waves spread out as they travel. C. The medium through which the waves travel absorbs the energy of the waves. D. The waves slow down as they travel away from the source. E. The frequency of the waves decreases as they get farther from the source.
A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.0 s, assuming no air?
A) 9.8 m/s upward B) 9.8 m/s downward C) 0 m/s D) 19.6 m/s downward