Suppose it is a crescent moon, as seen from Earth. How would Earth appear to someone on the Moon at this time?
A) The side of Earth facing the Moon is completely bright.
B) The illumination of the Earth does not change, as viewed from the Moon.
C) Half of the side of Earth facing the Moon is bright and half is dark.
D) Most of the side of Earth facing the Moon is bright.
D) Most of the side of Earth facing the Moon is bright.
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Two masses, MA and MB, with MB = 2MA, are released at the same time and allowed to fall straight down. Neglect air resistance. When we compare their kinetic energies after they have fallen for equal times, we find that
a. KB = KA. b. KB = 2KA. c. KB = 4KA. d. KA = 2KB. e. KA = 4KB.
In simple harmonic motion, the acceleration is proportional to
A) the velocity. B) the frequency. C) the amplitude. D) the displacement. E) all of the above
What shape are moons?
a. nearly spherical b. large ones are spherical; small ones are irregular c. small ones are spherical; large ones are irregular d. Earth’s and Jupiter’s moons are spherical; Uranus’s and Neptune’s are not
A concave mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?
A) 50 cm B) 20 cm C) 15 cm D) 7.5 cm E) 5.0 cm