NS FL #5 Chemistry/Phys Q 2

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NS FL #5 Chemistry/Phys Q 2

Post by sdaswani » Mon Mar 11, 2019 8:18 am

Hi -- between B and C for this question, why is B a better choice? the velocity of the pitch decreases because of the reduced amount of energy transfer through the torso.. but doesn't that happen because of the uncoupling i.e., larger amounts of energy dissipated by the body during follow through? Is it because B more "closely" or rather directly explains the "decrease in velocity"? Thanks!!
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Re: NS FL #5 Chemistry/Phys Q 2

Post by NS_Tutor_Will » Tue Mar 12, 2019 8:30 am

We're looking for some reason that the velocity of the pitch would decrease. Uncoupling the kinetic chain would reduce the efficiency of the energy transfer, which means that less energy would end up as the KE of the ball since it would have dissipated earlier in the chain. There would be more energy dissipated, to be sure, but that energy wouldn't be dissipated in the follow through. Also, we're looking to explain why the velocity of the ball is lower in answer choice C, but that explanation is more focused on energy (injury would be more likely if less energy was dissipated).

I hope this helps!
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