A critically bound universe is geometrically flat
Indicate whether the statement is true or false
TRUE
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You have observed the wobble in the velocity curves of two otherwise identical stars. Star A has a period of 6 months and Star B has a period of 1 year. What can you say about these stars?
A) It is impossible to say anything about the planets orbiting these stars. B) Star B must have a planet like Earth. C) Star A's planet must be closer than Star B's planet. D) Star A's planet is more massive than Star B's planet.
A 1000-kg car and a 2000-kg car are hoisted to the same height. Raising the more massive car requires
A) less work. B) as much work. C) twice as much work. D) four times as much work. E) more than four times as much work.
When you step off a bus moving at 2 m/s, your horizontal speed when you meet the ground is
A) zero. B) less than 2 m/s but greater than zero. C) about 2 m/s. D) greater than 2 m/s.
A net force of 125 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2. The mass of the object is
A) 3000 kg. B) 2880 kg. C) 144 kg. D) 0.200 kg. E) 5.20 kg.