Why does one cycle of lunar phases take 29.53 days even though the Moon orbits Earth in 27.32 days?
What will be an ideal response?
A complete cycle of lunar phases takes 29.53 days, the synodic period. The sidereal period, which is the orbital period of the Moon with respect to the stars, is 27.32 days, which is more than 2 days shorter.
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Based on Shapley's determination of the center of the galaxy, the Sun is located ____
a. in the galactic halo b. near the center of the galaxy c. at the edge of the galactic bulge d. in the middle portion of the galactic disk e. at the outer edge of the galactic disk
Mass and Weight: An object has a mass of 60 kg on Earth. What are the mass and weight of this object on the surface of the Moon where the acceleration due to gravity is only 1/6 of what it is on Earth?
What will be an ideal response?
The Sun's magnetic field is evident in the looped shapes of
a. solar flares. b. sunspots. c. the corona. d. granules. e. prominences.
Buoyancy: As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it if it started above the surface of the water?
A. The buoyant force keeps increasing steadily. B. The buoyant force remains constant. C. The buoyant force first increases and then remains constant. D. The buoyant force steadily decreases.