Chapter 10 review

    Standardized test practice
    1. George does 18 J of work to lift a 1 kg box at a constant speed. If he drops it, how fast will the box be going when it hits the ground?
      1. 18 m/s
      2. 1.8 m/s
      3. 6 m/s
      4. 36 m/s

    2. A 0.70 kg ball is placed on a vertical 200 N/m spring that is compressed 40 cm. When the spring is released, how high above its starting point will the ball go?
      1. 2.3 m
      2. 5.8 m
      3. 80 m
      4. 0.40 m

    3. A 15 kg ball is thrown straight upward with a speed of 20 m/s. What is the maximum height the ball reaches?
      1. 14.0 m
      2. 19.8 m
      3. 20.4 m
      4. 40.8 m

    4. A 2.0 kg ball, traveling at 1.0 m/s, rolls off of a cliff of height 3.0 m. If the ball lands directly on top of an unstretched spring with a spring constant of 40 N/m, how far does it compress the spring?
      1. 0.22 m
      2. 0.68 m
      3. 1.7 m
      4. 1.4 m

    5. Dennis drops a quarter from a skyscraper with floors spaced 3 m apart. If the quarter hits the ground at 25 m/s, how many floors above ground is Dennis? (Ignore air drag.)
      1. 20 floors
      2. 10 floors
      3. 2 floors
      4. 32 floors

    6. A man accelerates a crate across a rough, level floor with an efficiency of 50%. Which is true?
      1. Energy is not conserved, because the efficiency is less than 100%.
      2. Part of the man’s work goes into the kinetic energy of the crate, while the other part of his work is done against friction.
      3. The energy gained by the crate equals the work done by the man.
      4. The work done by the man equals the distance the crate moves multiplied by the friction.

    1. Kate pushes a box at a constant speed with a constant force of 30 N up a frictionless incline 3 m long. If the box weighs 90 N, how high off the ground does she push it?
      1. 0.5 m
      2. 1.0 m
      3. 1.5 m
      4. 2.0 m

    2. For a typical car, approximately 65% of the energy in the fuel is radiated away as heat, 13% is output as work in moving the car, 10% is spent overcoming friction, 7% is spent idling rather than moving, and 5% runs accessories (e.g., the heater). What is the efficiency of the typical car?
      1. 13%
      2. 20%
      3. 23%
      4. 30%

    3. A 500 kg roller coaster starts from rest at a height of 40 m. What is its speed when it is 13 m off the ground?
      1. 28 m/s
      2. 16 m/s
      3. 23 m/s
      4. 9 m/s

      4. Possible bar graphs of kinetic energy, gravitational potential energy, and elastic potential energy for a pole vaulter right before leaving the ground
    4. Which bar graph might represent the kinetic energy (KE), gravitational potential energy (GPE), and elastic potential energy (EPE) of a pole vaulter just before she leaves the ground at the beginning of the vault?
      1. 1
      2. 2
      3. 3
      4. 4

    5. A 70 kg woman who wants to climb up the 900 m face of the El Capitan vertical rock formation in Yosemite ponders her fate were she to fall without using a safety rope. How fast would she be traveling at the bottom when she hits the ground were she to fall from the top of the cliff’s face?
      1. 13.6 m/s
      2. 93.9 m/s
      3. 132.8 m/s
      4. 17,640 m/s

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