# HW11 - homework 11 RAHMAN TARIQUE Due Mar 3 2008 3:00 am...

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homework 11 – RAHMAN, TARIQUE – Due: Mar 3 2008, 3:00 am 1 Question 1, chap 8, sect 1. part 1 of 1 10 points A weight lifter lifts a mass m at constant speed to a height h in time t . How much work W is done by the weight lifter? 1. W = m g h t 2. W = m g h t 3. W = m g 4. W = m g h 5. W = m h Question 2, chap 8, sect 1. part 1 of 1 10 points A frictionless pendulum of length 3 m swings with an amplitude of 10 . At its max- imum displacement, the potential energy of the pendulum is 10 J. What is the kinetic energy of the pendulum when its potential energy is 5 J? 1. K = 5 J 2. K = 3 . 3 J 3. K = 15 J 4. K = 6 . 7 J 5. K = 10 J Question 3, chap 8, sect 1. part 1 of 1 10 points A block of mass m slides on a horizontal frictionless table with an initial speed v 0 . It then compresses a spring of force constant k and is brought to rest. The acceleration of gravity is 9 . 8 m / s 2 . v m k m μ = 0 How much is the spring compressed x from its natural length? 1. x = v 0 radicalbigg m g k 2. x = v 2 0 2 m 3. x = v 0 radicalbigg m k 4. x = v 2 0 2 g 5. x = v 0 m k g 6. x = v 0 m k g 7. x = v 0 k g m 8. x = v 0 radicalBigg k m g 9. x = v 0 m g k 10. x = v 0 radicalbigg k m Question 4, chap 8, sect 1. part 1 of 1 10 points A 5 kg mass is attached to a light cord that passes over a massless, frictionless pulley. The other end of the cord is attached to a 3 . 2 kg mass. The acceleration of gravity is 9 . 8 m / s 2 .

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homework 11 – RAHMAN, TARIQUE – Due: Mar 3 2008, 3:00 am 2 7 . 8 m ω 5 kg 3 . 2 kg Use conservation of energy to determine the final speed of the first mass after it has fallen (starting from rest) 7 . 8 m. Answer in units of m / s.
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