06 - fryer (vdf96) Assignment 4.5 graves (6) 1 This...

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Unformatted text preview: fryer (vdf96) Assignment 4.5 graves (6) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Assume you are on a planet similar to Earth where the acceleration of gravity is approxi- mately 10 m / s 2 . A block of mass 26 kg lies on an inclined plane, as shown. The horizon- tal and vertical supports for the plane have lengths of 24 m and 10 m, respectively, and the coefficient of kinetic friction between the plane and the block is 0 . 6. 2 6 k g = . 6 F 24 m 10m The magnitude of the force vector F necessary to pull the block up the plane with constant speed is most nearly 1. bardbl vector F bardbl 244 N correct 2. bardbl vector F bardbl 152 N 3. bardbl vector F bardbl 170 N 4. bardbl vector F bardbl 84 N 5. bardbl vector F bardbl 150 N 6. bardbl vector F bardbl 290 N 7. bardbl vector F bardbl 100 N 8. bardbl vector F bardbl 270 N 9. bardbl vector F bardbl 172 N 10. bardbl vector F bardbl 74 N Explanation: Let : x = 24 m , y = 10 m , m = 26 kg , g 10 m / s 2 , and a = 0 m / s 2 . s x y s = radicalbig x 2 + y 2 = radicalBig (24 m) 2 + (10 m) 2 = 26 m , sin = y s = 10 26 , and cos = x s = 24 26 . Consider the free body diagram for the block N N F mg Perpendicular to the ramp, F net = N F g = 0 N = F g = mg cos . Parallel to the ramp, F net = F g bardbl + F k F = ma = 0 F = F g bardbl + F k = mg sin + k N = mg (sin + k cos ) = (26 kg) (10 m / s 2 ) bracketleftbigg 10 26 + (0 . 6) 24 26 bracketrightbigg = 244 N . 002 10.0 points A block accelerates 3 m / s 2 down a plane in- clined at angle 27.0 . fryer (vdf96) Assignment 4.5 graves (6) 2 The acceleration of gravity is 9 . 81 m / s 2 . m k 3 m / s 2 27 Find k between the block and the inclined plane. 1. 0.148 2. 0.510 3. 0.166 correct 4. 1.289 5. 0.853 Explanation: Given : a = 3 m / s 2 , = 27 , and g = 9 . 81 m / s 2 ....
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This note was uploaded on 12/11/2011 for the course PHYSICS 101 taught by Professor Graves during the Fall '10 term at San Jose City College.

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06 - fryer (vdf96) Assignment 4.5 graves (6) 1 This...

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