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Import Settings: Base Settings: Brownstone Default Information Field: Difficulty Information Field: SectionDef Highest Answer Letter: E Multiple Keywords in Same Paragraph: No Chapter: Chapter 6 Multiple Choice 1. In which one of the following situations is zero net work done? A) A ball rolls down an inclined plane. B) A physics student stretches a spring. C) A projectile falls toward the surface of Earth. D) A box is pulled across a rough floor at constant velocity. E) A child pulls a toy across a rough surface causing it to accelerate. Ans: D Difficulty: Medium SectionDef: Section 6-1 and 6-2 2. Complete the following statement: Work may be expressed using all of the following units except A) N ⋅ m. B) joule. C) erg. D) ft ⋅ lb. E) watt. Ans: E

Difficulty: Easy SectionDef: Section 6-1 and 6-2 3. 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° Ans: A Difficulty: Medium SectionDef: Section 6-1 and 6-2 4. 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 each time he pushes it 9.1 m across the yard. A) 510 J B) 260 J C) 410 J D) 360 J E) 310 J Ans: E Difficulty: Medium SectionDef: Section 6-1 and 6-2 5. 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. Ans: B Difficulty: Medium SectionDef: Section 6-1 and 6-2 6. A force with a magnitude of 25 N and directed at an angle of 37° above the horizontal is used to move 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 Ans: E Difficulty: Medium SectionDef: Section 6-1 and 6-2 7. A constant force of 25 N is applied as shown to a block which undergoes a displacement of 7.5 m to the right along a frictionless surface while the force acts. What is the work done by the force? Question is WRONG A) zero joules B) +94 J C) –94 J D) +160 J E) –160 J Ans: C Difficulty: Hard SectionDef: Section 6-1 and 6-2 8. 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?

Displacement is 0 A) zero joules B) 2.7 J C) 6.0 J D) 25 J E) 33 J Ans: A Difficulty: Medium SectionDef: Section 6-1 and 6-2 9. Julie carries an 8.0-kg suitcase as she walks 18 m along a horizontal walkway to her hotel room at a constant speed of 1.5 m/s. How much work does Julie do in carrying her suitcase? A) zero joules B) 40 J C) 200 J D) 300 J E) 2000 J Ans: A Difficulty: Medium SectionDef: Section 6-1 and 6-2 10. Which one of the following situations is an example of an object with a non-zero kinetic energy? A) a drum of diesel fuel on a parked truck B) a stationary pendulum C) a satellite in geosynchronous orbit D) a car parked at the top of a hill E) a boulder resting at the bottom of a cliff Ans: C Difficulty: Easy SectionDef: Section 6-1 and 6-2 11. Which one of the following statements concerning kinetic energy is true?

A) Kinetic energy can be measured in watts. B) Kinetic energy is always equal to the potential energy. C) Kinetic energy is always positive. D) Kinetic energy is a quantitative measure of inertia. E) Kinetic energy is directly proportional to velocity. Ans: C Difficulty: Medium SectionDef: Section 6-1 and 6-2 12. Which one of the following has the largest kinetic energy? A) a raindrop falling B) a woman swimming C) a jet airplane flying at its maximum speed D) the earth moving in its orbit around the sun E) the space shuttle orbiting the Earth Ans: D Difficulty: Medium SectionDef: Section 6-1 and 6-2 13. In which one of the following situations will there be an increase in kinetic energy? A) A projectile approaches its maximum height. B) A ball starts from rest and freely rolls downhill. C) A box is pulled across a rough floor at constant speed. D) A satellite travels in a circular orbit around the earth at fixed altitude. E) A stone at the end of a string is whirled in a horizontal circle at constant speed. Ans: B Difficulty: Easy SectionDef: Section 6-1 and 6-2 14. An experimental 1500-kg car travels at a constant speed of 22 m/s around a circular test 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 Ans: B Difficulty: Easy SectionDef: Section 6-1 and 6-2 15. 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 Ans: D Difficulty: Easy SectionDef: Section 6-1 and 6-2 16. How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s? A) 24 000 J B) 280 000 J C) 540 000 J D) 820 000 J E) 12 000 J Ans: C Difficulty: Medium SectionDef: Section 6-1 and 6-2

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