Anonymous
Anonymous asked in Science & MathematicsPhysics · 4 years ago

help with physics please?

Harold the Hurler is a physics student who is renowned for his baseball pitching arm. In order to determine the amount of work he performs in throwing a baseball, Harold devises an experiment. He stands at the bottom of a deep pit and hurls a 0.143-kg baseball through an open third-floor window in a nearby building. Harold\'s aim is so accurate that the ball then smoothly enters the tube of the Baseball Absorber that Harold invented and patented. In this device the ball compresses a spring until it comes momentarily to rest, and this maximum amount of compression is recorded as 0.429 m. The spring\'s force constant is 877 N/m, and the position of the baseball\'s momentary rest is 7.15 m above ground level. The point in the pit where the Hurler starts his pitch is 14.7 m below ground level. How much work does Harold perform on the baseball? Take g = 9.80 m/s2.

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  • NCS
    Lv 7
    4 years ago
    Favorite Answer

    All of Harold's work is converted into gravitational potential energy and spring potential energy.

    GPE = mgh = 0.143kg * 9.80m/s² * (7.15+14.7)m = 30.6 J

    SPE = ½kx² = ½ * 877N/m * (0.429m)² = 80.7 J

    work = GPE + SPE = 111 J

    If you find this helpful, please award Best Answer!

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