Suppose you continue to lift the board described in problem N4T.7. Assume that the force you exert is always perpendicular to the board and that one end of the board always remains on the ground. What happens to the magnitude of the force you exert on the end as the angle between the board and the ground increases? It
A. Increases.
B. Decreases.
C. Remains the same.
D. The answer depends on information not given.
B. Decreases.
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A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
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Neglecting air resistance, a ball projected straight upward so it remains in the air for 10 seconds needs an initial speed of
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