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Unformatted text preview: Homework4- help Chap. 5 & 6 5.35. Model: Use the particle model for the object. Solve: (a) We are told that for an unknown force (call it ) F acting on an unknown mass (call it ) m the acceleration of the mass is 2 8 m/s . According to Newton’s second law, 2 (8 m/s ). F m = The force then becomes 2 . F Newton’s second law gives ( ) 2 2 2 8 m s F m a m = = This means a is 2 16 m/s . (b) The force is F and the mass is now 2 . m Newton’s second law gives ( ) 2 2 8 m s F m a m = = This means 2 4 m/s . a = (c) A similar procedure gives 2 8 m/s . a = (d) A similar procedure gives 2 32 m/s . a = 5.9. Visualize: Please refer to Figure EX5.9. Solve: Mass is defined to be 1 slope of the acceleration-versus-force graph m = Thus ( ) ( ) 1 1 1 1 1 1 2 1 5 3 slope of line 1 9 3 5 5 25 slope of line 2 3 3 5 a m N m a N---- = = = = The ratio of masses is 1 2 9 25 m m = 5.40. Visualize: Solve: (d) There is an object on an inclined surface. The net force is down the plane so the acceleration is down the plane. The net force includes both the frictional force and the component of the gravitational force. The the plane....
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This note was uploaded on 04/18/2010 for the course PHYS ? taught by Professor Zhou during the Spring '10 term at Georgia State.
- Spring '10