hmwk-2-Fall-2006 - PHY 317K September 14, 2006 HOMEWORK # 2...

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Page 1 PHY 317K September 14, 2006 HOMEWORK # 2 DUE on September 20, 2006 by 8:00pm Instructions: Use an ANSWER SHEET to mark answers. Provide your NAME (last, first), UTEID , and UNIQUE NUMBER of the course. Sign and date it. The answer sheets must be placed in the 317K box by bulletin board outside PAI 2.48. Late homework will not be graded. Answer the following 41 questions: 1. An object moving at constant velocity in an inertial frame must: A) have a net force on it B) eventually stop due to gravity C) not have any force of gravity acting on it D) have zero net force acting on it E) have no frictional force acting on it 2. A newton is the force: A) of gravity on a 1 kg body B) of gravity on a 1 g body C) that gives a l g body an acceleration of 1 cm/s 2 D) that gives a 1 kg body an acceleration of 1 m/s 2 E) that gives a 1 kg body an acceleration of 9.8 m/s 2 3. The inertia of a body tends to cause the body to: A) speed up B) slow down C) resist any change in its motion D) fall toward the Earth E) decelerate due to friction
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Page 2 4. A heavy ball is suspended as shown. A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string. The first result occurs because: \ A) the force is too small to move the ball B) action and reaction is operating C) the ball has inertia D) air friction holds the ball back E) the ball has too much energy 5. Two objects, one having three times the mass of the other, are dropped from the same height in a vacuum. At the end of their fall, their velocities are equal because: A) anything falling in vacuum has constant velocity B) all objects reach the same terminal velocity C) the acceleration of the larger object is three times greater than that of the smaller object D) the force of gravity is the same for both objects E) none of the above 6. The block shown moves with constant velocity on a horizontal surface. Two of the forces on it are shown. A frictional force exerted by the surface is the only other horizontal force on the block. The frictional force is: A) 0 B) 2 N, leftward C) 2 N, rightward D) slightly more than 2 N, leftward E) slightly less than 2 N, leftward 7. Equal forces ¢ act on isolated bodies A and B. The mass of B is three times that of A. The magnitude of the acceleration of A is: A) three times that of B B) 1/3 that of B C) the same as B D) nine times that of B E) 1/9 that of B
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Page 3 8. A constant force of 8.0 N is exerted for 4.0 s on a 16-kg object initially at rest. The change in speed of this object will be: A) 0.5 m/s B) 2 m/s C) 4 m/s D) 8 m/s E) 32 m/s 9. A ball with a weight of 1.5 N is thrown at an angle of 30 ° above the horizontal with an initial speed of 12 m/s. At its highest point, the force of gravity on the ball is: A) 9.8 N, 30 ° below horizontal B) zero C) 9.8 N, up D) 9.8 N, down E) 1.5 N, down 10. Two forces are applied to a 5.0-kg crate on a frictionless surface; one is 6.0 N to the north and the other is 8.0 N to the west. The magnitude of the acceleration of the crate is:
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This note was uploaded on 04/30/2008 for the course PHY 317k taught by Professor Kopp during the Fall '07 term at University of Texas at Austin.

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hmwk-2-Fall-2006 - PHY 317K September 14, 2006 HOMEWORK # 2...

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