phys2425b - Name: Section: REVIEW Chapters 7 - 12 PHYS 2425...

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Name: Section: R E V I E W Chapters 7 - 12 PHYS 2425 - Brooks Select the response that best answers the given statement. Be sure to write all final multiple choice answers on your Scantron answer sheet. 1. Camping equipment weighing 6000 N is pulled across a frozen lake by means of a horizontal rope. The coefficient of kinetic friction is 0.05. How much work is done by the campers in pulling the equipment 1000 m if its speed is increasing at the constant rate of 0.20 m/s 2 ? A) –1.2 × 10 6 J B) 1.8 × 10 5 J C) 3.0 × 10 5 J D) 4.2 × 10 5 J E) 1.2 × 10 6 J 2. A 0.50-kg object moves on a horizontal frictionless circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. If it starts from rest, then at the end of one revolution the radial component of the force of the track on it is: A) 19 N B) 38 N C) 47 N D) 75 N E) 96 N 3. A man pushes an 80-N crate a distance of 5.0 m upward along a frictionless slope that makes an angle of 30 ° with the horizontal. The force he exerts is parallel to the slope. If the speed of the crate is constant, then the work done by the man is: A) –200 J B) 61 J C) 140 J D) 200 J E) 260 J 4. A 6.0-kg block is released from rest 80 m above the ground. When it has fallen 60 m its kinetic energy is approximately: A) 4800 J B) 3500 J C) 1200 J D) 120 J E) 60 J
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5. A 0.50-kg block attached to an ideal spring with a spring constant of 80 N/m oscillates on a horizontal frictionless surface. When the spring is 4.0 cm longer than its equilibrium length, the speed of the block is 0.50 m/s. The greatest speed of the block is: A) 0.23 m/s B) 0.32 m/s C) 0.55 m/s D) 0.78 m/s E) 0.93 m/s 6. The potential energy of a particle moving along the x axis is given by U ( x ) = (8.0J/m 2 ) x 2 + (2.0J/m4) x 4 . If the total mechanical energy is 9.0 J, the limits of motion are: A) –0.96 m; +0.96 m B) –2.2 m; +2.2 m C) –1.6 m; +1.6 m D) –0.96 m; +2.2 m E) –0.96 m; +1.6 m 7. A 5-kg projectile is fired over level ground with a velocity of 200 m/s at an angle of 25 ° above the horizontal. Just before it hits the ground its speed is 150 m/s. Over the entire trip the change in the thermal energy of the projectile and air is: A) +19,000 J B) –19,000 J C) +44,000 J D) –44,000 J E) 0 8. A 0.75-kg block slides on a rough horizontal table top. Just before it hits a horizontal ideal spring its speed is 3.5 m/s. It compresses the spring 5.7 cm before coming to rest. If the spring constant is 1200 N/m, the thermal energy of the block and the table top must have: A) not changed B) decreased by 1.9 J C) decreased by 2.6 J D) increased by 1.9 J E) increased by 2.6 J
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9. A small object slides along the frictionless loop-the-loop with a diameter of 3 m. What minimum speed must it have at the top of the loop? A) 1.9 m/s
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This note was uploaded on 11/11/2008 for the course PHYS 2425 taught by Professor Sherman during the Spring '08 term at Collin College.

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phys2425b - Name: Section: REVIEW Chapters 7 - 12 PHYS 2425...

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