Physics HW 3

# Physics HW 3 - kim (jkk547) HW03 Tsoi (58020) 1 This...

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Unformatted text preview: kim (jkk547) HW03 Tsoi (58020) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A block of mass m is pushed a distance D up an inclined plane by a horizontal force F . The plane is inclined at an angle with respect to the horizontal. The block starts from rest and the coefficient of kinetic friction is k . m D k F If N is the normal force, what is the work done by friction? 1. W = k ( N + mg cos ) D 2. W = + k ( N + mg cos ) D 3. W = k N D 4. W = 0 5. W = k ( N mg cos ) D 6. W = + k N D 7. W = + k ( N mg cos ) D 002 (part 2 of 3) 10.0 points What is the work done by the normal force N ? 1. W = N D 2. W = ( N + mg cos + F sin ) D 3. W = 0 4. W = ( mg cos + F sin N ) D 5. W = ( N mg cos F sin ) D 6. W = N D cos 7. W = N D 8. W = N D sin 003 (part 3 of 3) 10.0 points What is the final speed of the block? 1. v = radicalbigg 2 m ( F sin k N ) D 2. v = radicalbigg 2 m ( F cos + mg sin ) D 3. v = radicalbigg 2 m ( F cos mg sin + k N ) D 4. v = radicalbigg 2 m ( F cos mg sin ) D 5. v = radicalbigg 2 m ( F cos + mg sin k N ) D 6. v = radicalbigg 2 m ( F cos k N ) D 7. v = radicalbigg 2 m ( F sin + k N ) D 8. v = radicalbigg 2 m ( F cos mg sin k N ) D 004 (part 1 of 2) 10.0 points Two masses m 1 and m 2 are connected in the manner shown. m 2 m 1 T 1 T 2 a = g 2 The system is accelerating downward with acceleration of magnitude g 2 . Determine T 2 . 1. T 2 = m 2 g 2. T 2 = parenleftbigg 1 2 m 2 m 1 parenrightbigg g kim (jkk547) HW03 Tsoi (58020) 2 3. T 2 = parenleftbigg m 2 1 2 m 1 parenrightbigg g 4. T 2 = 1 2 ( m 2 m 1 ) g 5. T 2 = 3 2 m 2 g 6. T 2 = 1 2 m 2 g 005 (part 2 of 2) 10.0 points Determine T 1 . 1. T 1 = 1 2 ( m 1 + m 2 ) g 2. T 1 = 5 2 ( m 1 + m 2 ) g 3. T 1 = ( m 1 + m 2 ) g 4. T 1 = 3 2 ( m 1 + m 2 ) g 5. T 1 = 2 ( m 1 + m 2 ) g 6. None of these 006 10.0 points Pretend you are on a planet similar to Earth where the acceleration of gravity is approxi- mately 10 m / s 2 . The coefficient of kinetic friction between the plane and the block is 0 . 4. A block of mass 39 kg lies on an inclined plane, as shown below. The horizontal and vertical supports for the plane have lengths of 36 m and 15 m, respectively. 3 9 k g = . 4 F 36 m 15m 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 86 N 2. bardbl vector F bardbl 170 N 3. bardbl vector F bardbl 294 N 4. bardbl vector F bardbl 110 N 5. bardbl vector F bardbl 428 N 6. bardbl vector F bardbl 108 N 7. bardbl vector F bardbl 200 N 8. bardbl vector F bardbl 220 N 9. bardbl vector F bardbl 76 N 10. bardbl vector F bardbl 366 N 007 10.0 points10....
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## Physics HW 3 - kim (jkk547) HW03 Tsoi (58020) 1 This...

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