Earth's radius at the equator is larger than that at the poles. Where is Earth's surface gravity more?
A. at the equator
B. at the top of Mount Everest
C. at the North and South Poles
D. It is the same everywhere.
Answer: C
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When two galaxies collide, what happens to their stars?
A. About 30% of them collide and become black holes. B. The evolution of all the stars in the larger galaxy is accelerated. C. About 50% of them become binary stars. D. Nothing happens to them, except that their orbits may change.
In 1916, Einstein published his__________that described gravity as a curvature of space-time
A) relative theory of consumption B) velocity-addition formulation theory C) density functional theory D) general theory of relativity
A 350-g air track cart on a horizontal air track is attached to a string that goes over a pulley with a moment of inertia of 6.00 × 10-6 kg?m2 and a radius of 1.35 cm. The string is pulled vertically downward by a force of 2.50 N
What is the acceleration of the cart? A) 7.14 m/s2 B) 6.53 m/s2 C) 5.27 m/s2 D) 4.98 m/s2 E) 3.27 m/s2