Exam2Sol - 7.5kg 6.25x104kg 25o 0.25m/s Fpush 10.0kg 13o...

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2 5 .0 ο m 7.5kg 25 o F push μ s = 0.300 μ k = 0.150 n f W = mg = 73.5N 10.0kg 5.00kg F push 3.00kg 13 o mg F s r 6.25x10 4 kg 0.25m/s 7.65x10 4 kg 0.30m/s 6.25x10 4 kg 7.65x10 4 kg v f Introductory Physics I PHYS 2211-160 Exam #2 Chapters 5-10 Name____ Solutions ______________ Show all your work on these sheets, and make sure to box your answers! For Questions #1 – 6, consider a 15.0kg block initially at rest on an incline as shown in the diagram. There is a coefficient of static friction of 0.600 between the block and the surface, and a coefficient of kinetic friction of 0.100 between the block and the surface. 1. (5 points) What is the magnitude of the weight acting on the block? a) 147N b) 133N c) 88.2N d) 79.9N e) 62.1N W = mg = (15.0kg) (9.80m/s 2 ) = 147N f) 37.3N g) 14.7N h) 13.3N i) 6.21N j) 0 2. (5 points) What is the magnitude of the normal force acting on the block? a) 147N b) 133N c) 88.2N d) 79.9N e) 62.1N n = mg cos θ = (15.0kg) (9.80m/s 2 ) cos25.0 o = 133N f) 37.3N g) 14.7N h) 13.3N i) 6.21N j) 0
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3. (5 points) What is the magnitude of the component of the weight of the block acting down the incline? a) 147N b) 133N c) 88.2N d) 79.9N e) 62.1N W x = mg sin θ = (15.0kg) (9.80m/s 2 ) sin25.0 o = 62.1N f) 37.3N g) 14.7N h) 13.3N i) 6.21N j) 0 4. (5 points) What is the magnitude of the static frictional force acting on the block?
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This note was uploaded on 09/25/2011 for the course PHYSICS 22 taught by Professor Lomant during the Spring '11 term at Georgia Perimeter.

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Exam2Sol - 7.5kg 6.25x104kg 25o 0.25m/s Fpush 10.0kg 13o...

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