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Chapter 3: Q.18CQ (page 120)

A basketball player dribbling down the court usually keeps his eyes fixed on the players around him. He is moving fast. Why doesn’t he need to keep his eyes on the ball?

Short Answer

Expert verified

A basketball player always keeps his eyes on the other players around him instead of looking at the ball while dribbling down the court.

Step by step solution

01

Step 1: Defining frame of reference

A frame of reference is a collection of coordinates used to indicate the relationship between a moving observer and an event. The frame of reference is further classified into the inertial and the non-inertial frames of reference.

02

Determining relative speed of ball

When the basketball player gets the ball and dribbles down the court, the relative speed of the ball and the player is equal.

The frame of reference is also the same, while the player fixed his eyes on the players around him as the players around him keep their eyes on the ball, and this helps him to move fast.

If proper practice is done, it is not necessary for a good player to look at the ball while moving fast.

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Most popular questions from this chapter

Bryan Allen pedaled a human-powered aircraft across the English Channel from the cliffs of Dover to Cap Gris-Nez on June 12, 1979. (a) He flew for169min at an average velocity of3.53m/s in a direction45osouth of east. What was his total displacement? (b) Allen encountered a headwind averaging2.00m/s almost precisely in the opposite direction of his motion relative to the Earth. What was his average velocity relative to the air? (c) What was his total displacement relative to the air mass?

Suppose you walk \({\bf{18}}.{\bf{0}}\)m straight west and then \({\rm{25}}{\rm{.0}}\) m straight north. How far are you from your starting point, and what is the compass direction of a line connecting your starting point to your final position? (If you represent the two legs of the walk as vector displacements A and B , then this problem asks you to find their sum R = A + B .)

(a) Another airplane is flying in a jet stream that is blowing at m/sin a direction south of east. Its direction of motion relative to the Earth is south of west, while its direction of travel relative to the air is south of west. What is the airplane’s speed relative to the air mass?

(b) What is the airplane’s speed relative to the Earth?

Suppose you first walk 12.0 m in a direction 20º west of north and then 20.0 m in a direction 40.0º south of west. How far are you from your starting point and what is the compass direction of a line connecting your starting point to your final position? (If you represent the two legs of the walk as vector displacements A and B , as in Figure 3.56, then this problem finds their sum R = A + B.)

A rugby player passes the ball\(7.00{\rm{ m}}\)across the field, where it is caught at the same height as it left his hand.

(a) At what angle was the ball thrown if its initial speed was\(12.0{\rm{ m}}/{\rm{s}}\), assuming that the smaller of the two possible angles was used?

(b) What other angle gives the same range, and why would it not be used?

(c) How long did this pass take?
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