This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: 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 = mg h t 2. W = mg ht 3. W = mg 4. W = mg h 5. W = mh 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 . 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 = 0 How much is the spring compressed x from its natural length? 1. x = v radicalbigg mg k 2. x = v 2 2 m 3. x = v radicalbigg m k 4. x = v 2 2 g 5. x = v mk g 6. x = v m k g 7. x = v k g m 8. x = v radicalBigg k mg 9. x = v mg k 10. x = v 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 . homework 11 RAHMAN, TARIQUE Due: Mar 3 2008, 3:00 am 2 7 . 8 m 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....
View Full
Document
 Fall '08
 Turner
 Physics, Mass, Work

Click to edit the document details