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TYPICAL NUMERIC QUESTIONS FOR PHYSICS I REGULAR QUESTIONS TAKEN FROM CUTNELL AND JOHNSON WORK AND ENERGY CONTENT STANDARD IV A 1. A concrete block is...

A 10.0-kg crate slides along a horizontal frictionless surface at a constant speed of 4.0 m/s. The crate then slides down a frictionless incline and across a second horizontal surface as shown in the figure.
25. What is the kinetic energy of the crate as it slides on the upper surface?
A) 30 J B) 80 J C) 140 J D) 290 J E) 490 J
26. While the crate slides along the upper surface, how much gravitational potential energy does it have compared to what it would have on the lower surface?
A) 30 J B) 80 J C) 140 J D) 290 J E) 490 J
TYPICAL NUMERIC QUESTIONS FOR PHYSICS I REGULAR QUESTIONS TAKEN FROM CUTNELL AND JOHNSON WORK AND ENERGY CONTENT STANDARD IV A 1. A concrete block is pulled 7.0 m across a frictionless surface by means of a rope. The tension in the rope is 40 N; and the net work done on the block is 247 J. What angle does the rope make with the horizontal? A) 28° B) 41° C) 47° D) 62° E) 88° 2. Mike is cutting the grass using a human-powered lawn mower. He pushes the mower with a force of 45 N directed at an angle of 41° below the horizontal direction. Calculate the work that Mike does on the mower in pushing it 9.1 m across the yard. A) 510 J B) 460 J C) 410 J D) 360 J E) 310 J 3. A 5.00-kg block of ice is sliding across a frozen pond at 2.00 m/s. A 7.60-N force is applied in the direction of motion. After the ice block slides 15.0 m, the force is removed. The work done by the applied force is A) 114 J B) +114 J C) 735 J D) +735 J E) +19.7 J 4. A force of magnitude 25 N directed at an angle of 37° above the horizontal moves a 10- kg crate along a horizontal surface at constant velocity. How much work is done by this force in moving the crate a distance of 15 m? A) zero joules B) 1.7 J C) 40 J D) 98 J E) 300 J 5. A 1.0-kg ball on the end of a string is whirled at a constant speed of 2.0 m/s in a horizontal circle of radius 1.5 m. What is the work done by the centripetal force during one revolution? A) zero joules B) 2.7 J C) 6.0 J D) 25 J E) 33 J Page 1
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6. Brenda carries an 8.0-kg suitcase as she walks 25 m along a horizontal walkway to her room at a constant speed of 1.5 m/s. How much work does Brenda do in carrying her suitcase? A) zero joules B) 40 J C) 200 J D) 300 J E) 2000 J 7. A 1500-kg car travels at a constant speed of 22 m/s around a circular track that is 80 m across. What is the kinetic energy of the car? A) zero joules B) 3.6 × 10 5 J C) 3.3 × 10 4 J D) 1.6 × 10 4 J E) 7.2 × 10 5 J 8. The kinetic energy of a car is 8 × 10 6 J as it travels along a horizontal road. How much work is required to stop the car in 10 s? A) zero joules B) 8 × 10 4 J C) 8 × 10 5 J D) 8 × 10 6 J E) 8 × 10 7 J 9. How much energy is dissipated in braking a 1000-kg car to a stop from an initial speed of 20 m/s? A) 20 000 J B) 200 000 J C) 400 000 J D) 800 000 J E) 10 000 J 10. The kinetic energy of an 1100-kg truck is 4.6 × 10 5 J. What is the speed of the truck? A) 21 m/s B) 29 m/s C) 33 m/s D) 17 m/s E) 25 m/s 11. A 40-kg block is lifted vertically 20 meters from the surface of the earth. To one significant figure, what is the change in the gravitational potential energy of the block? A) +800 J B) 800 J C) +8000 J D) 8000 J E) zero joules 12. A 1500-kg elevator moves upward with constant speed through a vertical distance of 25 m. How much work was done by the tension in the cable? A) 990 J B) 8100 J C) 140 000 J D) 370 000 J E) 430 000 J 13. A 12-kg crate is pushed up an incline from point A to point B as shown in the figure. What is the change in the gravitational potential energy of the crate? A) +590 J B) 590 J C) +1200 J D) 1200 J E) +60 J Page 2
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This question was asked on Mar 18, 2010.

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