Chapter 9 review

    Standardized test practice
    1. Anthony is standing on the top of a building 10 m high holding a 7 kg bowling ball. Mildred dug a 2-m-deep hole next to the base of the building. What is the gravitational potential energy of the bowling ball relative to the bottom of the hole?
      1. 137.2 J
      2. 548.8 J
      3. 686.0 J
      4. 823.2 J

    2. How much energy is stored in a spring with a spring constant of 500 N/m if it is compressed a distance of 0.4 m?
      1. 80 J
      2. 100 J
      3. 20 J
      4. 40 J

    3. A dock worker pushes a 50 kg crate up a 1-m-high, 3-m-long ramp. Ignoring friction, how much work did he do?
      1. 150 J
      2. 490 J
      3. 1,470 J
      4. 1,960 J

    4. If you push a car with a constant force for 13 m and it gains 91 J of energy, with what force did you push it?
      1. 7 N
      2. 3 N
      3. 10 N
      4. 16 N

    5. If an object is moving at a speed of 5 m/s and has kinetic energy of 600 J, what must its mass be?
      1. 81 kg
      2. 60 kg
      3. 96 kg
      4. 48 kg

    6. How much energy does it take to accelerate a 90 kg object from rest to 13 m/s?
      1. 3,681 J
      2. 7,605 J
      3. 6,943 J
      4. 9,810 J

    1. The kilowatt hour (kWh) is commonly used to measure electricity usage. How many joules is a kilowatt hour?
      1. 1×103 J
      2. 1 J
      3. 6×103 J
      4. 3.6×106 J

    2. Three 5 V batteries are wired in series to power a light bulb. If 5 A of current is flowing through the circuit, how much power is the light bulb drawing?
      1. 20 W
      2. 25 W
      3. 75 W
      4. 100 W

    3. A 300 W motor in a bowling alley lifts a 6 kg bowling ball directly upward at a constant speed. At what speed does the ball rise?
      1. 1.00 m/s
      2. 5.10 m/s
      3. 7.07 m/s
      4. 10.0 m/s
      5. 17.3 m/s

    4. Which of the following is the most likely energy flow diagram for the electric lighting in one’s house?
      1. nuclear energy > thermal energy > light energy
      2. mechanical energy > light energy > pressure energy
      3. light energy > electrical energy > nuclear energy
      4. chemical energy > electrical energy > light energy

    5. A 4 kg electric car has a 9 V battery powering the motor. If 1.5 A runs through the circuit to run the motor at a constant power and it is accelerating from rest, how fast will the car be moving after 10 s?
      1. 0.34 m/s
      2. 8.22 m/s
      3. 16.43 m/s
      4. 67.5 m/s

    6. An object 4 m off the ground has 300 J of gravitational potential energy. How much gravitational potential energy does it have relative to the bottom of a hole 8 m deep?
      1. 300 J
      2. 600 J
      3. 900 J
      4. 1,200 J

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