Which planet has the hottest surface temperature?
A. Venus
B. Mercury
C. Mars
D. Earth
Answer: A
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Gravitational Potential Energy: In 1994, fragments of Comet P/Shoemaker-Levy 9 collided with Jupiter. Assume that these fragments came from very very far away with no initial speed, and neglect the effect of the sun. What was their speed when they neared Jupiter's surface at a distance of 71.4 × 106 m from its center? Jupiter has a mass of 1.90 × 1027 kg, and G = 6.67 × 10-11 N ? m2/kg2.
A. 10,400 m/s B. 11,200 m/s C. 35,500 m/s D. 42,100 m/s E. 59,600 m/s
A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman. When this force equals the weight of the fireman, what happens?
A) The fireman comes to a stop. B) The fireman descends with slower and slower speed. C) The fireman descends with a smaller acceleration. D) The fireman continues to descend, but with constant speed. E) Cannot be determined without additional information.
Earth is nearly twice as large as Venus
Indicate whether the statement is true or false
The primary factor for galactic evolution is ________
Fill in the blank(s) with correct word