physics 2

# physics 2 - PH 105 Jones Review #2 Spring 2008 1. A block...

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PH 105 Review #2 Jones Spring 2008 1. A block of aluminum has weight 2.0N and density 2700 kg/m 3 . What fraction of the block’s volume is submerged when the block floats in mercury (density 13,600 kg/m 3 )? (a) 0.20 (b) 0.80 (c) 1.0 (d) 0.37 (e) 0.07 2. In a race down an inclined plane, which of the following shapes will win? (a) a sphere (b) a hoop (c) a solid disc (d) the answer depends on the radius of the object (e) the race will end in a tie. 3. An Atwood’s machine consists of masses m 1 and m 2 connected by a light string, which passes over a pulley of mass M, radius R, and moment of inertia I. The tension in the string connected to m 1 is T 1 , while the tension in the other end of the string is designated T 2 . If m 2 > m 1 , what is the relation between T 1 and T 2 ? (a) They are equal but not zero. (d) T 2 >T 1 , but (c) is not true. (b) They are both zero. (e) T 1 > T 2 . (c) T 1 = m 1 g and T 2 = m 2 g. 4. A man of weight W pushes down on the large end of a hydraulic lift. The area of the large cylinder is 40 cm 2 , and that of the smaller cylinder is 2 cm 2 . If a weight of 40 N on the small end will lift the man off the ground, what is his weight W? (a)

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## This note was uploaded on 04/07/2008 for the course PH 105 taught by Professor Stanjones during the Spring '08 term at Alabama.

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physics 2 - PH 105 Jones Review #2 Spring 2008 1. A block...

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