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Midterm2_fall09_key-fin

# Midterm2_fall09_key-fin - PHY 2048-S4 Fall 2009...

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PHY 2048-S4, Fall 2009 Examination #2 October 20, 2009 Instructor: Beatriz Roldan Cuenya Name______________________________________ID______________ Please answer all questions. #1______________ #2______________ #3______________ #4______________ Total: ___________ Show all work and enter answers in boxes, if provided.

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1. A 0.2 kg block slides along an incline plane with coefficient of kinetic friction μ k =0.2. (a) What should be the minimum angle of the incline in order to have the block slipping down? (b) If the angle of the incline plane is 30 ° , calculate the work done by the frictional force when the block slides down the incline a distance of 3 m. (c) What is the work done by the gravitational force during the 3-m downward displacement? (d) What is the minimum external force parallel to the surface of the incline plane that will start the block moving up the incline? Assume a 30 ° incline plane. (a) (b) (c) (d) α
2. The figure below shows a block of mass M 2 = 4 kg on a frictionless plane inclined at angle θ = 40º. It is connected by a cord of negligible mass to a block of mass M 1 = 1 kg on a horizontal frictionless surface. The pulley is frictionless and massless.

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Midterm2_fall09_key-fin - PHY 2048-S4 Fall 2009...

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