# S99s(1) - Physics 4A SECOND EXAM Chapters 1 8 Spring 1999...

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Physics 4A SECOND EXAM Chapters 1 - 8 Spring 1999 1 Name:_________________________________________ Solve the following problems in the space provided. Use the back of the page if needed. Each problem is worth 20 points. You must show your work in a logical fashion starting with the correctly applied physical principles which are on the last page. Your score will be maximized if your work is easy to follow because partial credit will be awarded. 1. The initial mass of a rocket is 1.50x10 4 kg and the initial acceleration is 5.00m/s 2 upward. (a)Find the weight of the rocket and (b)find the upward force on the rocket exerted by the exhaust gases from the engine. (c)If this upward force is the “action” force acting on the rocket, find the size of the “reaction” force. (d)Name the object that the reaction force acts on. (a)Using the mass/weight rule, F g = mg = (1.50x10 4 )(9.80) F g = 1.47x10 5 N . (b)Applying Newton’s Second Law, Σ F = ma F th - F g = ma F th = ma + F g F th = (1.50x10 4 )(5.00) + 1.47x10 5 F th = 2.22x10 5 N . (c)According to Newton’s Third Law the sizes of the action and reaction are

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S99s(1) - Physics 4A SECOND EXAM Chapters 1 8 Spring 1999...

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