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Homework 5

Homework 5 - homework 05 ALIBHAI ZAHID Latest unpenalized...

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homework 05 – ALIBHAI, ZAHID 1 Latest unpenalized work: Feb 19 2007 Mon- day 04:00 (after this date you can not make a perfect score). Work cutoff: Feb 21 2007, 4:00 am. Question 1 part 1 of 4 10 points A box of mass m with an initial velocity of v 0 slides down a plane, inclined at θ with respect to the horizontal. The coefficient of kinetic friction is μ . The box stops after sliding a distance x . m μ k v 0 θ How far does the box slide? 1. x = v 2 0 2 g ( μ cos θ + sin θ ) 2. x = v 2 0 g (sin θ - μ cos θ ) 3. x = v 2 0 2 g ( μ sin θ + cos θ ) 4. x = v 2 0 g ( μ sin θ - 2 cos θ ) 5. x = v 2 0 2 g sin θ 6. x = v 2 0 2 g (sin θ - μ cos θ ) 7. x = v 2 0 2 g μ cos θ 8. x = v 2 0 g ( μ sin θ + cos θ ) 9. x = v 2 0 2 g ( μ sin θ - cos θ ) 10. x = v 2 0 2 g ( μ cos θ - sin θ ) Question 2 part 2 of 4 10 points How much work is done by friction? 1. W = - μ m v 2 0 cos θ 2 ( μ sin θ - cos θ ) 2. W = - μ m g x sin θ 3. W = - μ m v 0 2 ( μ - tan θ ) 4. W = - μ m g x tan θ 5. W = - m g ( μ cos θ + sin θ ) 6. W = - μ m g x cos θ 7. W = - μ m v 0 2 ( μ + tan θ ) 8. W = - m g ( μ cos θ - sin θ ) 9. W = 0 10. W = - μ m v 2 0 2 ( μ + tan θ ) Question 3 part 3 of 4 10 points How much work is done by the normal force? 1. W = - μ m v 0 2 ( μ + tan θ ) 2. W = - μ m g x cos θ 3. W = - m g ( μ cos θ + sin θ ) 4. W = 0 5. W = - μ m v 2 0 2 ( μ + tan θ ) 6. W = - μ m g x sin θ 7. W = - μ m g x tan θ 8. W = - μ m v 2 0 cos θ 2 ( μ sin θ - cos θ ) 9. W = - μ m v 0 2 ( μ - tan θ ) 10. W = - m g ( μ cos θ - sin θ )

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homework 05 – ALIBHAI, ZAHID 2 Question 4 part 4 of 4 10 points How much work is done by gravity? 1. W = m v 0 tan θ 2. W = m v 0 2 tan θ 3. W = m g x cos θ 4. W = m g (cos θ + sin θ ) 5. W = m v 2 0 tan θ 6. W = m g (cos θ - sin θ ) 7. W = m g x tan θ 8. W = m v 2 0 2 tan θ 9. W = m g x sin θ 10. W = 0 Question 5 part 1 of 3 10 points As shown in the figure, a block of mass 2 . 2 kg is pushed up against the vertical wall by a force of 64 N acting at 48 to the ceiling. The coefficient of kinetic friction between the block and the wall is 0 . 63.
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