Which of these things has an inverse-square relationship?
a. The radius of a sphere and its volume.
b. The length of a side of its square room and its area.
c. The intensity of sunlight and distance from the sun.
d. The number of squares on a chessboard and the size of each square.
e. The two sides of a right triangle and the third side.
c
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Equilibrium: A 5.00-m-long uniform ladder, weighing 200 N, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall. The coefficient of static friction between the ladder and the floor is 0.200. How far up the ladder, measured along the ladder, can a 600-N person climb before the ladder begins to slip?
A. 1.50 m B. 1.26 m C. 1.05 m D. 3.95 m E. 4.56 m
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Answer the following statement true (T) or false (F)
When our Earth becomes tidally locked with the Moon, which of the following statements will be true?
A. The Moon will only be visible from one side of Earth. B. An astronaut on the Moon will always see the day side of Earth. C. There will be no eclipses. D. The Moon will not go through phases.
The purpose of the moderator in a reactor is to
A. separate the nuclear fuel from the spent products of fission. B. provide cooling for the control rods. C. reduce the number of neutrons available for the chain reaction. D. slow neutrons down so that they will be more likely to initiate fission reactions.