King Fahd University of Petroleum & Minerals
Department of Physics

Quiz 3

Name:________________________________________ 		 Id #:____________

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Q:	Consider a constant force F acting on an object of  mass m = 100 kg and directed 30 degrees above the horizontal if the object starts with a speed of  4 m/s  from the initial point A.  

a)	Find the work done by the force F in moving the object a distance of 10 m from A to B along the frictionless surface.

b)	Find the speed of the mass m at point B.

King Fahd University of Petroleum & Minerals
Department of Physics

Quiz 3

Name:________________________________________ 		 Id #:____________

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Q:	Consider a mass m = 1 kg at height h = 1 m on the top of an incline with q = 30o. If the mass starts from rest at A and moves down all along the incline to reach point B, find :

a)	The work done by gravity from A to B.

b)	The final velocity at the bottom of the incline if m = 0.2 .

King Fahd University of Petroleum & Minerals
Department of Physics

Quiz 3

Name:________________________________________ 			 Id #:____________

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Q:	A cord is used to lift vertically an initially stationary mass M = 100 kg to a height 10 m.

a)	What is the work done by gravity on the mass M during the lift.

b)	If the mass is lifted with a constant acceleration a = g / 2 find the work done
by the tension ( g = 9.8 m/s**2 ).