When a cube is inscribed in a sphere of radius r, the length L of a side of the cube is 
. If a positive point charge Q is placed at the center of the spherical surface, the ratio of the electric flux ?sphere at the spherical surface to the flux ?cube at the surface of the cube is
A.
.B.
.C.
D.
.E.
.Answer: C
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X-rays easily penetrate Earth's atmosphere and reach the ground from space
a. True b. False Indicate whether the statement is true or false
As an object is lowered into a deep hole in the ground, which of the following assumptions must be made in regard to the object's potential energy?
a. The potential energy increases. b. The potential energy decreases. c. The potential energy remains constant. d. The potential energy increases and then decreases.
A 1.20-kg ball is hanging from the end of a rope. The rope hangs at an angle 25.0° from the vertical when a 15.0 m/s horizontal wind is blowing. If the wind's force on the rope is negligible, what drag force does the wind exert on the ball?
A) 32.3 N B) 24.1 N C) 3.68 N D) 5.48 N E) 11.8 N
James and John dive from an overhang into the lake below. James simply drops straight down from the edge. John takes a running start and jumps with an initial horizontal velocity of 25 m/s. Compare the time it takes each to reach the lake below
A) James reaches the surface of the lake first. B) John reaches the surface of the lake first. C) James and John will reach the surface of the lake at the same time. D) Cannot be determined without knowing the mass of both James and John. E) Cannot be determined without knowing the weight of both James and John.