You drop a stone down a well. You hear the splash 2.23 s later. How deep is the well? The speed of sound in air is 343 m/s
A)
6.96 m
B)
20.2 m
C)
22.9 m
D)
18.8 m
E)
20.0 m
C
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The stability of a bicycle is due to angular momentum of the wheels when the bicycle is moving forward. The stability is due to the net angular momentum vector, which
A. points upward, perpendicular to the surface of Earth, thereby canceling the weight of the bicycle and rider. B. points to the rider's left. C. is actually zero, since the back wheel cancels the angular momentum of the front wheel. D. increases when the bicycle slows down due to conservation of energy.
The central core inside an atom is the neutron
a. True b. False Indicate whether the statement is true or false
Suppose an equation relating position, x, to time, t, is given by x = bt3 + ct4, where b and c are constants. The dimensions of b and c are respectively:
a. T3, T4. b. 1/T3, 1/T4. c. L/T3, L/T4. d. L2/T3, L2/T4.
Why do models suggest that Uranus and Neptune formed elsewhere?
A) We do not have very good models. B) The density of materials was too low in their current orbits for the ice giants to have formed there. C) Jupiter and Saturn took up most of the material in the area; Uranus and Neptune must have formed elsewhere. D) It is too cold at their current locations for the ice giants to have formed there.