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Unformatted text preview: homework 01 – RAHMAN, TARIQUE – Due: Jan 28 2008, 3:00 am 1 Question 1, chap 1, sect 6. part 1 of 1 10 points A certain force is given by the equation F = KML 2 /T 4 , where M is a mass, L is a length, T is a time and where K is a constant. What are units of the constant K ? 1. [ K ] = T 2 /L correct 2. [ K ] = T 2 /ML 3. [ K ] = L/T 2 4. [ K ] = T 6 /M 2 L 2 5. [ K ] = M 2 L 2 /T 6 6. [ K ] = ML/T 2 Explanation: Solving for K we get K = FT 4 ML 2 Since the dimensions of force are [ F ] = ML/T 2 , we get [ K ] = ( ML/T 2 ) T 4 ML 2 = T 2 L Question 2, chap 4, sect 1. part 1 of 1 10 points A ball rolling up a hill has vector velocities vectorv 1 and vectorv 2 at times t 1 and t 2 , respectively, as shown in the figure. v 1 initial v 2 final Which vector diagram below most accu rately depicts the direction of the ball’s aver age acceleration over the interval? 1. 2. 3. 4. 5. correct 6. 7. Zero vector. 8. 9. Explanation: In fact the two forces exerting on the ball, the gravitational force from the earth and the force from the incline remain unchanged dur ing the interval, to total acceleration should homework 01 – RAHMAN, TARIQUE – Due: Jan 28 2008, 3:00 am 2 be downward to the left and won’t change either. Question 3, chap 2, sect 5. part 1 of 1 10 points Two particles are at the same point at the same time, initially moving in the same di rection. Particle A has an initial velocity of 6 . 4 m / s and an acceleration of 3 m / s 2 . Parti cle B has an initial velocity of 2 . 4 m / s and an acceleration of 5 . 4 m / s 2 ....
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This note was uploaded on 02/03/2010 for the course PHY 303K taught by Professor Turner during the Fall '08 term at University of Texas at Austin.
 Fall '08
 Turner
 Physics, Force, Mass, Work

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