The passage f: sweet spot - solved page 148 has disconcerted me!
First of all, the solutions assume that the centre of percussion is the only place to damp vibrations, whereas, it is clearly mentioned in the first paragraph that the "lesser known" spot, will ALSO diminish the strain on players arm.
This reasoning has been used in answer 5. I feel it is A.
Also, for the 7th question, C seems erroneous to me. Nowhere has it been mentioned (or implied) that centre of percussion would produce a cleaner shot compared to the primary sweet spot. The ALSO in the first paragraph should justify my reasoning.
Also for the 2nd question, I choose C. I felt, no where it is mentioned more than 2 forces will act and at least made the answer contemptuous for me. For 2 I chose A, first because the "only" makes it too restrictive, and secondly, since the question is about forces and option A is not relating to forces.
I am sure, I would be going wrong somewhere- kindly let me know where?
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- thechintanshah
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- tommywallach
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Re: Passage F: Sweet Spot RC Guide Doubt
Hey Chintan,
I can't agree with you on your first two issues here, but I agree slightly with your third issue. See below!
First, you cite answer choice 5, but you seem to have misread the correct answer. It says "Striking a tennis ball at a spot other than the center of percussion can result in a jarring feeling." Notice the word I've italicized. This is the key. It doesn't say striking some other spot would always result in a jarring feeling. Only that it can. We absolutely know this from the passage.
Second, for question seven, you have to be very careful with your reading of the physics here. We have been told DEFINITIVELY that the second sweet spot is the only spot on the racket which imparts no motion to the end of the handle (there can't be another place on the racket that does this, by the laws of physics). This means there is definitively less jerking motion, allowing for a cleaner stroke (as a clean stroke is described at the end of the passage).
I'm confused about your last question, because you wrote that you chose both A and C, which I don't understand. C is there, as the explanation says, because there is both translational (Forward/backward) and rotational forces acting on the racket. (A) is wrong because the only is way too strong. However, I agree with you that there's something of a contradiction here, because it's implying that you can eliminate the jolt by hitting the original sweet spot, but the question you asked about before says you cannot eliminate the jolt in any way other than hitting the center of percussion. Hmm. I'm going to look into this one and see if maybe we can adjust the language in future editions. Hold tight.
-t
I can't agree with you on your first two issues here, but I agree slightly with your third issue. See below!
First, you cite answer choice 5, but you seem to have misread the correct answer. It says "Striking a tennis ball at a spot other than the center of percussion can result in a jarring feeling." Notice the word I've italicized. This is the key. It doesn't say striking some other spot would always result in a jarring feeling. Only that it can. We absolutely know this from the passage.
Second, for question seven, you have to be very careful with your reading of the physics here. We have been told DEFINITIVELY that the second sweet spot is the only spot on the racket which imparts no motion to the end of the handle (there can't be another place on the racket that does this, by the laws of physics). This means there is definitively less jerking motion, allowing for a cleaner stroke (as a clean stroke is described at the end of the passage).
I'm confused about your last question, because you wrote that you chose both A and C, which I don't understand. C is there, as the explanation says, because there is both translational (Forward/backward) and rotational forces acting on the racket. (A) is wrong because the only is way too strong. However, I agree with you that there's something of a contradiction here, because it's implying that you can eliminate the jolt by hitting the original sweet spot, but the question you asked about before says you cannot eliminate the jolt in any way other than hitting the center of percussion. Hmm. I'm going to look into this one and see if maybe we can adjust the language in future editions. Hold tight.
-t
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