If a freely-falling object were somehow equipped with a speedometer on a planet where the acceleration due to gravity is 20 m/s2, then its speed reading would increase each second by
A) 10 m/s.
B) 20 m/s.
C) 30 m/s.
D) 40 m/s.
E) depends on its initial speed
Answer: B
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A. 15 N/m. B. 14 N/m. C. 13 N/m. D. 12 N/m. E. 11 N/m.
The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2 )
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Consider a student whose mass is 70 kg. If all his mass were converted to electrical energy, for how many years could he keep a 100-W light bulb burning?
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When a ball rises vertically to a height h and returns to its original point of projection, the work done by the gravitational force is
a. 0. b. -mgh. c. +mgh. d. -2mgh. e. +2mgh.