A woman who weighs 500 N stands on a 6.0-m-long board that weighs 100 N. The board is supported at each end. The support force at the right end is 3 times the support force at the left end. How far from the right end is the woman standing?
a. 4.8 m b. 2.1 m
c. 1.7 m d. 1.2 m
e. 3.9 m
d
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A converging lens will cause parallel rays of light to
A. Bend to meet at the focal point of the lens. B. Remain parallel C. Bend as though coming from the focal point of the lens. D. Scatter in random directions.
Sunspots
A) were most numerous during the Maunder Minimum. B) are always found close to the Sun's poles. C) are relatively constant in number every year. D) come in pairs, representing the north and south magnetic fields. E) travel over the surface of the Sun from pole to pole.
Because most reflecting surfaces are horizontal, the polarization axes of ordinary sunglasses are
A) vertical. B) horizontal. C) at right angles to each other.
The earth's northern magnetic pole is located
A) near Tasmania. B) near Antarctica. C) at the North Pole. D) at the South Pole. E) in northern Canada.