Phys205A_Lecture21

# Physics for Scientists & Engineers with Modern Physics (4th Edition)

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Unformatted text preview: Lecture 21 Tests and solutions 1) The driver of a speeding empty truck slams on the brakes and skids to a stop through a distance d . If the truck now carries a load that doubles its mass, what will be the truck’s “skidding distance”? A) d B) 4d C) d 2 2) In the figure, if the tension in string 1 is 34 N and the tension in string 2 is 24 N, what is the mass of the object shown? (cos 40 = 0.766 ; sin 40=0.64) a. 7.3 kg b. 5.5 kg c. 1.8 kg d. 3.7 kg e. 4.5 kg 3) A small ball is released from rest at position A and rolls down a vertical circular track under the influence of gravity. When the ball reaches position B, which of the indicated directions most nearly corresponds to the direction of the normal force on the ball? A) 1 B) 2 C) 3 D) 5 E) 6 F) 7 G) 8 H) 9 M 1 40 40˚ 2 ) A block of mass m is on a rough surface in vacuum, with a spring attached and extended. As the block moves up the incline a small distance, how many forces are exerted on the mass?...
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## This document was uploaded on 09/27/2011.

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Phys205A_Lecture21 - Lecture 21 Tests and solutions 1) The...

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