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Physics

9th -

12thgrade

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Work, Energy, and Power

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15 questions

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  • 1. Multiple Choice
    3 minutes
    1 pt
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    Suppose a cart has a kinetic energy of 0.5 J. If you add enough mass to double the mass and make the cart go three times as fast, its kinetic energy is now ---.

    6 J

    3 J

    18 J

    9 J

  • 2. Multiple Choice
    2 minutes
    1 pt
    Image

    Two equal mass marbles are at the top of a ramp. One marble falls to the ground off the back while the other rolls down the ramp. What is true about the marbles when they reach the ground?

    The marble that rolled down the ramp is moving faster than the marble that fell.

    The marble that fell down the back of the ramp is moving faster than the marble that rolled.

    The marble that rolled down the ramp is not moving when it reaches the ground.

    The two marbles are moving with the same speed.

  • 3. Multiple Choice
    3 minutes
    1 pt
    Image

    A crane lifts an 8-m long steel girder weighing 2600 N up 15 m off the ground. The crane did ___ of work.

    0 J

    39000 J

    20800 J

    2600 J

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