hw 15 sol - Patel (pnp223) homework 15 Turner (92160) 1...

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Unformatted text preview: Patel (pnp223) homework 15 Turner (92160) 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 (part 1 of 2) 10.0 points Given: A block is pulled at a constant speed along a horizontal surface by a rope with ten- sion F T . The rope is inclined at an angle from the horizontal as shown in the figure below. The block moves a distance 13 m along the horizontal surface. The acceleration of gravity is 9 . 8 m / s 2 . 39 kg = 0 . 63 F T 4 3 What is the net work done by all the forces acting on the block? 1. W net =- 1838 . 74 J 2. W net = 0 correct 3. W net =- 4968 . 6 J 4. W net = 4968 . 6 J 5. W net = 3130 . 22 J 6. W net =- 3130 . 22 J 7. W net = 1971 . 81 J Explanation: Because the block is moving at a constant speed, the net force on it is zero. So the net work is also zero. 002 (part 2 of 2) 10.0 points Suppose that the force on the block F T is in- creased so that the block accelerates (starting from rest) at a = 1 . 6 m / s 2 . Now what is the net work done by all the forces acting on the block as it moves a dis- tance of 13 m? 1. W net = 1971 . 81 J 2. W net =- 811 . 2 J 3. W net =- 1971 . 81 J 4. W net = 2482 . 81 J 5. W net = 811 . 2 J correct 6. W net = 1460 . 81 J Explanation: Let L = 13 m . W = K = 1 2 m v 2 = 1 2 m (2 aL ) = maL = (39 kg) (1 . 6 m / s 2 ) (13 m) = 811 . 2 J . 003 (part 1 of 2) 10.0 points An amusement park ride consists of a rotating circular platform 9 . 68 m in diameter from which 10 kg seats are suspended at the end of 3 . 37 m massless chains. When the system rotates, the chains make an angle of 21 . 9 with the vertical....
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hw 15 sol - Patel (pnp223) homework 15 Turner (92160) 1...

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