The first person to suggest that the Earth moved around the Sun was
A) Aristarchus
B) Newton
C) Copernicus
D) Galileo
A
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Free Fall: A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. If it takes the 20-kg rock a time T to reach the ground, what time will it take the 10-kg rock to reach the ground?
A. 4T B. 2T C. T D. T/2 E. T/4
Pigs wallow in mud mainly to
A) decrease thermal conductivity. B) shield themselves from the Sun. C) cool themselves by evaporation.
The first scientist to determine that the orbits of the planets are ellipses was
A. Kepler. B. Newton. C. Ptolemy. D. Copernicus. E. Galileo.
An archer pulls her bow string back 0.40 m by exerting a force that increases uniformly from zero to 240 N. What is the equivalent spring constant of the bow, and how much work is done in pulling the bow?