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.
- NCSLv 74 years agoFavorite 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
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