Page 1 PHY 317K September 28, 2006 HOMEWORK # 3 DUE on October 11 by 8:00pm Instructions:Use a scantron ANSWER SHEET to mark answers. Provide your NAME(last, first), UTEID, and UNIQUE NUMBERof the course. Sign and date it. The answer sheets must be placed in the 317K box (by bulletin board outside PAI 2.48) by 8:00pm on Wednesday, October 11, 2006. Late homework will not be graded. Answer the following 55 questions: 1. Which of the following groups does NOT contain a scalar quantity? A) velocity, force, power B) displacement, acceleration, force C) acceleration, speed, work D) energy, work, distance E) pressure, weight, time 2. An object moves in a circle at constant speed. The work done by the centripetal force is zero because: A) the displacement for each revolution is zero B) the average force for each revolution is zero C) there is no friction D) the magnitude of the acceleration is zero E) the centripetal force is perpendicular to the velocity 3. The work done by gravity during the descent of a projectile is: 4. A sledge (including load) weighs 5000 N. It is pulled on level snow by a dog team exerting a horizontal force on it. The coefficient of kinetic friction between sledge and snow is 0.05. How much work is done by the dog team pulling the sledge 1000 m at constant speed? A) 2.5 ×104J B) 2.5 ×105J C) 5.0 ×105J D) 2.5 ×106J E) 5.0 ×106J
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