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# practicetestchapters5-8 - TEST 2 REVIEW PHYSICS 1401 Brooks...

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TEST 2 REVIEW PHYSICS 1401 - Brooks MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A 4 - kg mass moving with speed 2 m/s, and a 2 - kg mass moving with a speed of 4 m/s, are gliding over a horizontal frictionless surface. Both objects encounter the same horizontal force, which directly opposes their motion, and are brought to rest by it. Which statement correctly describes the situation? A) The 4 - kg mass travels twice as far as the 2 - kg mass before stopping. B) The 4 - kg mass loses more kinetic energy than the 2 - kg mass. C) Both masses travel the same distance before stopping. D) The 2 - kg mass travels farther, but not necessarily twice as far. E) The 2 - kg mass travels twice as far as the 4 - kg mass before stopping. Page Ref: Sec. 5.5 A ball is released, from rest, at the left side of the loop - the - loop, at the height, h, as shown in Figure 5 - 3. Figure 5 - 3 2) Refer to Figure 5 - 3. If the radius of the loop is R, what vertical height does the ball rise to, on the other side, neglecting friction? A) R B) greater than 2R C) less than R D) 2R Page Ref: Sec. 5.5 3) Assuming negligible friction, what spring constant would be needed by the spring in a "B - B gun" to fire a 10. gram pellet to a height of 100 meters if the spring is initially compressed 10. cm? A) 20. N/m B) 200. N/m C) 2.0 × 10 3 N/cm D) 2.0 × 10 - 3 N/m E) 20. N/cm Page Ref: Sec. 5.5 4) If both the mass and the velocity of a ball are tripled, the kinetic energy is increased by a factor of A) 27. B) 81. C) 9. D) 18. E) 6. Page Ref: Sec. 5.3 5) A 4.0 kg box of fruit slides 8.0 m down a ramp, inclined at 30.° from the horizontal. If the box slides at a constant velocity of 5.0 m/s, the work done by gravity is A) zero. B) + 78. J. C) - 0.16 kJ. D) 0.16 kJ. E) - 78. J. Page Ref: Sec. 5.1 1

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6) Which of the following is not a unit of work? A) Kw - h B) Kg - m/s C) W - s D) J E) N - m Page Ref: Sec. 5.1 7) Matthew pulls his little sister Sarah in a sled on an icy surface (assume no friction), with a force of 60.0 Newtons at an angle of 37.0° upward from the horizontal. If he pulls her a distance of 12.0 m, the work he does is A) 433 J B) 0.333 kJ C) 185 J D) 720 J E) 575 J Page Ref: Sec. 5.1 Use Figure 5 - 2 below to answer the following question(s). Figure 5 - 2 8) In Figure 5 - 2, showing a pendulum, at what position is the potential energy maximum? A) A B) B C) C Page Ref: Sec. 5.5 9) My 5.0 hp mower would be equivalent to an electric mower rated at what power? A) 3.7 KW B) 0.25 KW C) 0.78 KW D) 2.8 W E) 2.8 KW Page Ref: Sec. 5.6 10) On a plot of F vs. x, what represents the work done by the force F? A) the area under the curve B) the maximum F times minimum x C) the length of the curve D) the slope of the curve E) the product of the maximum force times the maximum x Page Ref: Sec. 5.1 11) Consider an ideal elastic spring. The spring constant is A) inversely proportional to the displacement. B) proportional to the mass attached to the spring.
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practicetestchapters5-8 - TEST 2 REVIEW PHYSICS 1401 Brooks...

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