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hmwk-2-K09

# hmwk-2-K09 - PHY 317K HOMEWORK 2 DUE on by 8:00pm...

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PHY 317K HOMEWORK # 2 DUE on September 21, 2009 by 8:00pm Instructions: Use a UT 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 located outside PAI 2.48. Late homework will not be graded . Answer the following 75 questions: 1. 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 2. 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 3. 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) both objects have the same acceleration 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 Page 1

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4. The block shown moves with constant velocity on a horizontal surface. Two horizontal external forces are applied to it, a 3 N force to the left and a 5 N force to the right, as shown. There is also a horizontal frictional force exerted by the surface on the block, which is not shown. The frictional force is: A) 0 B) 2 N, to the left C) 2 N, to the right D) slightly more than 2 N, to the right E) none of these 5. 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 6. A constant force of 10.0 N is exerted for 5.0 s on a 25-kg object, which was 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 7. A ball with a weight of 1.0 N is thrown at an angle of 30 ° above the horizontal with an initial speed of 12 m/s. There is no air resistance acting on the ball. At its highest point, the net force on the ball is: A) 4.9 N, 30 ° below horizontal B) zero C) 4.9 N, up D) 4.9 N, down E) none of these Page 2
8. Two forces are applied to a 25-kg crate; one is 60.0 N to the north and the other is 30.0 N to the west. These are the only forces acting on the crate. The magnitude of the acceleration of the crate is: A) 0.50 m/s 2 B) 1.5 m/s 2 C) 2.7 m/s 2 D) 5.2 m/s 2 E) 11 m/s 2 9. A 1200-kg elevator is rising and its speed is increasing at 2.2 m/s 2 . The tension in the elevator cable is: A) 6000 N B) 8000 N C) 10000 N D) 12000 N E) none of these 10. A 1200-kg elevator is decending and its speed is increasing at 2.8 m/s 2 . The tension in the elevator cable is: A) 6400 N B) 8400 N C) 10000 N D) 14000 N E) none of these 11. A pendulum bob weighing 2.5 N is held at an angle θ from the vertical by a 5.0 N horizontal force F as shown. The tension in the string supporting the pendulum bob (in newtons) is: A) 5 cos B) 2.5/sin C) 11 D) 5.6 E) none of these Page 3

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12. You stand on a spring scale on the floor of an elevator. Of the following, the scale
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hmwk-2-K09 - PHY 317K HOMEWORK 2 DUE on by 8:00pm...

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