At what minimum rate is a 60.0-kg boy converting his internal energy when, in 8.00 s, he runs up a flight of stairs that is 10.0-m high?
A) 75.0 W
B) 735 W
C) 4.80 kW
D) 48.0 W
B
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Four point charges are located at the corners of a square, 1.00 m by 1.00 m. On each of two diagonally opposite corners are 1.00 ?C charges. On each of the other two corners are - 1.00 ?C charges. What is the magnitude of the force on one of the positive charges?
a. 
b. 
c. 
d. 
e. 0.00
Weight and g: If you stood on a planet having a mass four times that of Earth's mass, and a radius two times that of Earth's radius, you would weigh
A. the same as you do on Earth. B. two times more than you do on Earth. C. two times less than you do on Earth. D. four times more than you do on Earth.
In simple harmonic motion, what is the restoring force proportional to?
a. the displacement b. the frequency c. the amplitude
The gibbous Moon is never visible in the daytime sky
a. True b. False Indicate whether the statement is true or false