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Just before it is struck by a racket, a tennis ball weighing 0.560 $\mathrm{N}$ has a velocity of $(20.0 \mathrm{m} / \mathrm{s}) \hat{\imath}-(4.0 \mathrm{m} / \mathrm{s}) \hat{\mathrm{J}}$ . During the3.00 $\mathrm{ms}$ that the racket and ball are in contact, the net force on the ball is constant and equal to $-(380 \mathrm{N}) \hat{\imath}+(110 \mathrm{N}) \mathrm{J}$ . (a) What are the $x$ -and $y$ components of the impulse of the net force applied to the ball? $(b)$ What are the $x-$ and $y$ -components of the final velocity of the ball?

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(a) $J_{x}=-1.14 \mathrm{N.S} \quad-\quad J_{y}=0.33 \mathrm{N.s}$(b) $v_{2 x}=0.05 \mathrm{m} / \mathrm{s} \quad-\quad v_{2 y}=1.775 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Sheffield

University of Winnipeg

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

04:35

Just before it is struck b…

05:35

03:53

04:29

03:00

A tennis player receives a…

06:28

$A$ tennis player swings h…

05:53

A tennis player swings her…

06:00

You and a friend are playi…

03:37

01:45

(II) Suppose the force act…

06:17

. Biomechanics. The mass o…

02:18

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