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# Though most tennis players generally strive to strike the

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Though most tennis players generally strive to strike the [#permalink]

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26 Sep 2012, 05:33
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Question 1
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85% (03:52) correct 15% (01:50) wrong based on 13

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Question 2
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50% (01:56) correct 50% (00:42) wrong based on 12

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Question 3
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54% (01:33) correct 46% (00:14) wrong based on 13

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Question 4
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77% (01:23) correct 23% (01:16) wrong based on 13

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Question 5
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92% (01:35) correct 8% (03:04) wrong based on 12

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Though most tennis players generally strive to strike the ball on the racket's vibration node, more commonly known as the "sweet spot," many players are unaware of the existence of a second, lesser- known location on the racket face, the center of per-cussion, that will also greatly diminish the strain on a player's arm when the ball is struck.

In order to understand the physics of this second sweet spot, it is helpful to consider what would happen to a tennis racket in the moments after impact with the ball if the player's hand were to vanish at the moment of impact. The impact of the ball would cause the racket to bounce backwards, experiencing a translational motion away from the ball. The tendency of this motion would be to jerk all parts of the racket, including the end of its handle, backward, or away from the ball. Unless the ball happened to hit the racket precisely at the racket's center of mass, the racket would additionally experience a rotational motion around its center of mass-much as a penny that has been struck near its edge will start to spin. Whenever the ball hits the racket face, the effect of this rotational motion will be to jerk the end of the handle forward, towards the ball. Depending on where the ball strikes the racket face, one or the other of these motions will predominate.

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. The reason for this lack of motion is that the force on the upper part of the hand would be equal and opposite to the force on the lower part of the hand, resulting in no net force on the tennis players' hand or forearm. 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.

The manner in which a tennis player can detect the center of percussion on a given tennis racket follows from the nature of this second sweet spot. The center of percussion can be located via simple trial and error by holding the end of a tennis racket between your finger and thumb and throwing a ball onto the strings. If the handle jumps out of your hand, then the ball has missed the center of percussion.
1. What is the primary message the author is trying to convey?
(A) a proposal for an improvement to the design of tennis rackets
(B) an examination of the differences between the two types of sweet spot
(C) a definition of the translational and rotational forces acting on a tennis racket
(D) a description of the ideal area in which to strike every ball
(E) an explanation of a lesser-known area on a tennis racket that dampens unwanted vibration
[Reveal] Spoiler:
E

2. According to the passage, all of the following are true of the forces acting upon a tennis racket striking a ball EXCEPT
(A) The only way to eliminate the jolt that accompanies most strokes is to hit the ball on the center of
percussion.
(B) The impact of the ball striking the racket can strain a tennis player's arm.
(C) There are at least two different forces acting upon the racket.
(D) The end of the handle of the racket will jerk forward after striking the ball unless the hall strikes the racket's center of mass.
(E) The racket will rebound after it strikes the ball.
[Reveal] Spoiler:
A

3. What is the primary function served by paragraph two in the context of the entire passagd
(A) to establish the main idea of the passage
(B) to provide an explanation of the mechanics of the phenomenon discussed in the passage
(C) to introduce a counterargument that elucidates the main idea of the passage
(D) to provide an example of the primary subject described in the passage
(E) to explain why the main idea of the passage would be useful for tennis players
[Reveal] Spoiler:
B

4. The author mentions "a penny that has been struck near its edge" in order to
(A) show how the center of mass causes the racket to spin
(B) argue that a penny spins in the exact way that a tennis racket spins
(C) explain how translational motion works
(D) provide an illustration of a concept
(E) demonstrate that pennies and tennis rackets do not spin in the same way
[Reveal] Spoiler:
D

5. Which of the following can be inferred from the passage?
(A) If a player holds the tennis racket anywhere other than the end of the handle, the player will experience a jolting sensation.
(B) The primary sweet spot is more effective at damping vibration than the secondary sweet spot.
(C) Striking a tennis ball at a spot other than the center of percussion can result in a jarring feeling.
(D) Striking a tennis ball repeatedly at spots other than a sweet spot leads to "tennis elbow."
(E) If a player lets go of the racket at the moment of impact, the simultaneous forward and backward impetus causes the racket to drop straight to the ground.
[Reveal] Spoiler:
C

Thanks for discussion
[Reveal] Spoiler: Question #1 OA
[Reveal] Spoiler: Question #2 OA
[Reveal] Spoiler: Question #3 OA
[Reveal] Spoiler: Question #4 OA
[Reveal] Spoiler: Question #5 OA

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Last edited by carcass on 28 Sep 2012, 07:33, edited 1 time in total.
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Re: Though most tennis players generally strive to strike [#permalink]

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26 Sep 2012, 06:03
1 - E

2 - A

3 - C {was confused between A and C, finally chose C}

4 - D

5 - B
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Re: Though most tennis players generally strive to strike [#permalink]

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26 Sep 2012, 06:27
methevoid wrote:
1 - E

2 - A

3 - C {was confused between A and C, finally chose C}

4 - D

5 - B

sorry methevoid 3 out of five correct
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Re: Though most tennis players generally strive to strike the [#permalink]

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26 Sep 2012, 22:29
1. E
2. A
3. A was confused with B
4.D
5. C
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Re: Though most tennis players generally strive to strike the [#permalink]

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27 Sep 2012, 15:51
My answers are - E C E D C

Let us know the OAs. Cheers!
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Re: Though most tennis players generally strive to strike the [#permalink]

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28 Sep 2012, 07:34

If you need some explanation. Here we are

Thanks
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Re: Though most tennis players generally strive to strike the [#permalink]

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30 Sep 2012, 23:44
Quote:
2. According to the passage, all of the following are true of the forces acting upon a tennis
racket striking a ball EXCEPT
(A) The only way to eliminate the jolt that accompanies most strokes is to hit the ball on the center of
percussion.
(B) The impact of the ball striking the racket can strain a tennis player's arm.
(C) There are at least two different forces acting upon the racket.
(D) The end of the handle of the racket will jerk forward after striking the ball unless the hall strikes the
racket's center of mass.
(E) The racket will rebound after it strikes the ball.

E is true according to common sense, but where from the passage, E can be concluded true. Can someone please explain ?
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Re: Though most tennis players generally strive to strike the [#permalink]

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01 Oct 2012, 03:08
Quote:
2. According to the passage, all of the following are true of the forces acting upon a tennis
racket striking a ball EXCEPT
(A) The only way to eliminate the jolt that accompanies most strokes is to hit the ball on the center of
percussion.
(B) The impact of the ball striking the racket can strain a tennis player's arm.
(C) There are at least two different forces acting upon the racket.
(D) The end of the handle of the racket will jerk forward after striking the ball unless the hall strikes the
racket's center of mass.
(E) The racket will rebound after it strikes the ball.

E is true according to common sense, but where from the passage, E can be concluded true. Can someone please explain ?

Quote:
(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 [#permalink]

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30 Dec 2012, 07:41
E
A
B
D
C
Took almost 10mins...
got stuck in 2nd ques bt gt it correct at last
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Re: Though most tennis players generally strive to strike the [#permalink]

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24 Nov 2013, 14:09
Could someone explain to me why question 2 is A?
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Re: Though most tennis players generally strive to strike the [#permalink]

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09 Apr 2014, 06:46
Can someone explain why correct answer to the last question is C ?
5. Which of the following can be inferred from the passage?
(C) Striking a tennis ball at a spot other than the center of percussion can result in a jarring feeling.

We are told in the first paragraph that there are TWO sweet spots. Moreover, answer to the second question (two sweet spots) contradicts the answer C to the above question. Maybe I am missing something, but it is really incomprehensible to me so far.
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Though most tennis players generally strive to strike the [#permalink]

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09 Mar 2015, 06:34
Got this one right 1.E 2.A 3.B 4.D 5.C

The main point is stated in the 1st paragraph: many players are unaware of the existence of a second, lesser-known location on the racket face, the center of percussion,
that will also greatly diminish the strain...

1. What is the primary message the author is trying to convey? --> General Question (find the main point)
(A) a proposal for an improvement to the design of tennis rackets --> You won't find any information about design in the whole passage....
(B) an examination of the differences between the two types of sweet spot --> There are no differences expained in the passage. In the first paragraph 2 Sweet points are stated. Only 2nd point is described in the followinf paragraphs.
(C) a definition of the translational and rotational forces acting on a tennis racket --> That's not the main point (see explanation above)
(D) a description of the ideal area in which to strike every ball --> It's not the only sweet point, so we can't say that the 2nd sweet point must be used to strike each ball
(E) an explanation of a lesser-known area on a tennis racket that dampens unwanted vibration --> CORRECT. Rephrasing of the main point ; All other choices were already eliminated.

2.According to the passage, all of the following are true of the forces acting upon a tennis
racket striking a ball EXCEPT
(A) The only way to eliminate the jolt that accompanies most strokes is to hit the ball
on the center of percussion --> CORRECT. 2nd sweet point is only one of two possible ways to achieve the elimination of the jolt.
(B) The impact of the ball striking the racket can strain a tennis players arm --> can be found in paragraph
(C) There are at least two different forces acting upon the racket. --> can be found in paragraph
(D) The end of the handle of the racket will jerk forward after striking the ball unless --> can be found in paragraph
the ball strikes the rackets center of mass.

(E) The racket will rebound after it strikes the ball --> can be found in paragraph (bounce back...)

This one most diff. for me... B or D ? Picked B at the end....
3.What is the primary function served by paragraph two in the context of the entire passage?
(A) to establish the main idea of the passage --> Main idea is stated in the 1st paragraph
(B) to provide an explanation of the mechanics of the phenomenon discussed in the
passage -> CORRECT. The 2nd paragraph starts with the words "In order to understand the physics of
this second sweet spot ..."

(C) to introduce a counterargument that elucidates the main idea of the passage --> It explains how the 2nd spot works
(D) to provide an example of the primary subject described in the passage --> To be honest, I can not eliminate this one, B sounds better for me....
(E) to explain why the main idea of the passage would be useful for tennis players --> it describes the mechanics... tennis player is not mentioned in the paragraph at all !

4.The author mentions “a penny that has been struck near its edge” in order to
(A) show how the center of mass causes the racket to spin --> The ball causes the racket to spin and not a center of mass
(B) argue that a penny spins in the exact way that a tennis racket spins --> can not be found in the paragpraph
(C) explain how translational motion works --> rotational motion NOT translational
(D) provide an illustration of a concept --> CORRECT. It's used just as illustration....
(E) demonstrate that pennies and tennis rackets do not spin in the same way --> spins like a penny.... ooposite....

5. Which of the following can be inferred from the passage?
(A) If a player holds the tennis racket anywhere other than the end of the handle, the
player will experience a jolting sensation. -->can not be found in the paragpraph .. to extreme..
(B) The primary sweet spot is more effective at damping vibration than the secondary
sweet spot --> no comparison can be found
(C) Striking a tennis ball at a spot other than the center of percussion can result in a
jarring feeling --> CORRECT. ...strain on a player's arm.
(D) Striking a tennis ball repeatedly at spots other than a sweet spot leads to “tennis
elbow
.” --> can not be found in the paragpraph
(E) If a player lets go of the racket at the moment of impact, the simultaneous forward
and backward impetus causes the racket to drop straight to the ground --> can not be found in the paragpraph
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Re: Though most tennis players generally strive to strike the [#permalink]

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25 Jul 2016, 11:32
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Re: Though most tennis players generally strive to strike the [#permalink]

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25 Jul 2016, 19:13
On option 5, I didn't feel any of the choices are working out.

I eliminated C - reason being, when you hit the ball "at a spot other than the center of percussion" does NOT eliminate the possibility that the ball could also hit the primary sweet spot, which will not lead to jarring feeling. Hence this statement is not entirely infallible.

Any thoughts....
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Re: Though most tennis players generally strive to strike the [#permalink]

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27 Jul 2016, 20:51
EDBDC in 9min.

in second question only option A is too extreme with use "the only way". It is my reason why it is correct
Re: Though most tennis players generally strive to strike the   [#permalink] 27 Jul 2016, 20:51
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