# HW20 - homework 20 RAHMAN TARIQUE Due 3:00 am Question 1...

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homework 20 – RAHMAN, TARIQUE – Due: Apr 18 2008, 3:00 am 1 Question 1, chap 14, sect 4. part 1 of 1 10 points A steel cable with a cross-sectional area of 1 . 5 cm 2 has a mass of 2 . 95 kg / m . Its Young’s modulus is 1 . 27 × 10 11 N / m 2 . The acceleration of gravity is 9 . 8 m / s 2 . If 762 m of the cable is hung over a vertical cliff, how much does the cable stretch under its own weight? Answer in units of cm. Question 2, chap 14, sect 4. part 1 of 1 10 points Use bulk modulus B = 2 . 1 × 10 9 Pa . What increase of pressure is required to change the volume of a sample of water by 0 . 71 %? Answer in units of Pa. Question 3, chap 15, sect 1. part 1 of 1 10 points When an object oscillating in simple har- monic motion is at its maximum displacement from the equilibrium position, which of the following is true of the values of its speed and the magnitude of the restoring force? Magnitude of Speed Restoring Force 1. Zero Maximum 2. Maximum Zero 3. 1 2 maximum 1 2 maximum 4. Zero Zero 5. Maximum 1 2 maximum Question 4, chap 15, sect 1. part 1 of 1 10 points A mass attached to a spring oscillates back and forth as indicated in the position vs. time plot below. P x t At point P, the mass has 1. negative velocity and zero acceleration. 2. positive velocity and positive accelera- tion. 3. positive velocity and zero acceleration. 4. negative velocity and negative accelera- tion. 5. zero velocity and zero acceleration. 6. negative velocity and positive accelera- tion.

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