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Re: Though most tennis players generally strive to strike the ba [#permalink]
Hi Carcass, Can you explain que 2? Why is the ans A when the passage establishes that hitting the centre of percussion helps avoid jolts? Why can't it be E?
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Re: Though most tennis players generally strive to strike the ba [#permalink]
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EXPLANATION QUESTION #2

EXCEPT questions require you to validate the answer choices. Go through the choices one by one, labeling true answers with a T and the one false answer with an F. ​(A) ​CORRECT. False. This choice contradicts information given in the first paragraph: the center of percussion is only one of two sweet spots that minimize vibration. The vibration node is the other sweet spot. ​(B) ​True. The first paragraph introduces the concept that the impact can “strain” the player’s arm. ​(C) ​True. The second paragraph describes at least two different forces that act upon a tennis racket striking the ball: “translational,” as described in the second and third sentences, and “rotational,” as described in the fourth and fifth sentences.
(D) ​True. The fourth sentence of the second paragraph states that “unless the ball happened to hit the racket precisely at the racket’s center of mass, the racket would additionally experience a rotational motion.” The fifth sentence then reads: “Whenever the ball hits the racket face, the effect of this rotational motion will be to jerk the end of the handle forward, toward the ball.” ​(E) ​True. The second sentence of the second paragraph states that a racket will “bounce backward” after striking the ball; these words are synonyms for rebound.
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Re: Though most tennis players generally strive to strike the ba [#permalink]
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Please aurora07

let me know if now is clear with the official solution . Otherwise, I will explain further.

Thank you
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Re: Though most tennis players generally strive to strike the ba [#permalink]
I also picked A for the Q7. Both translational and rotational still apply on the racket. It's just that they nullify each other and the player's arm is not strained. The racket still experiences a bounce. Please help
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Re: Though most tennis players generally strive to strike the ba [#permalink]
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Explanation

The relevant information is found in the third paragraph, which defines the function and benefit of the center of percussion (COP):
1. Definition of COP: "However, there is one point of impact, known as the center of percussion, which causes neither motion to predominate; if a ball were to strike this point, the impact would not impart any motion to the end of the handle."
2. Benefit to the Player: "The center of percussion constitutes a second sweet spot because a tennis player's wrist typically is placed next to the end of the racket's handle. When the player strikes the ball at the center of percussion, her wrist is jerked neither forward nor backward, and she experiences a relatively smooth, comfortable tennis stroke."

Therefore, the key effect of hitting the center of percussion is the elimination of the jerking motion felt at the wrist.

Why the other options are incorrect:

- A) Cause the racket to bounce backwards: The second paragraph states that any impact causes the racket to bounce backward (translational motion). Hitting the center of percussion prevents the handle from jerking due to rotational motion, but it does not prevent the entire racket from recoiling backward.
- C) Allow for a cleaner stroke than a ball striking a racket's primary sweet spot: The passage introduces the two sweet spots (vibration node and center of percussion) as both diminishing strain, but it never compares their effectiveness or the "cleanliness" of the resulting stroke. This comparison cannot be inferred from the text.
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Re: Though most tennis players generally strive to strike the ba [#permalink]
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