Hi, Below is my explanation
structure of passage -
para 1 - intro of secondary sweet spot
para2 - mechanism of sweet spot
para3 - why our sweet spot is so special
para 4 - how to discover /experience sweet spot on your racket.
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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 - correct, author is writing this passage to inform us about this second sweet spot . usae of though clears our doubt that sweet spot is not the main idea of the passage but SECOND sweet spot is ! . refer lines para1 - '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 percussion'chris139 2. According to the passage, all of the following are true of the forces acting upon a tennis racket striking a ball EXCEPT
THE ONLY OPTION THAT IS NOT TRUE IS BOLD ONE
(A) The only way to eliminate the jolt that accompanies most strokes is to hit the ball on the center of percussion.- correct.the iven lines in para 1 mentions 'WILL ALSO ' which means sweep spot also reduces the strain HENCE second sweet spot is NOT THE ONLY FORCE as mentioned in A . refer lines - '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 on a player's arm when the ball is struck.' (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.
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
(B) to provide an explanation of the mechanics of the phenomenon discussed in the passage - correct . the lines 'In order to understand the physics of this second sweet spot,'(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
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 . correct . the usage of 'AS' ...author mentioned the analogy to illustrate what it would spin like. refer lines ' the racket would additionally experience a rotational motion around its center '(E) demonstrate that pennies and tennis rackets do not spin in the same way
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. (no evidence)
(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. - Refer lines 3rd para & last para last lines '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.' + 'If the handle jumps out of your hand, then the ball has missed the center of percussion.' (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.