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A tennis ball machine holds 200 balls and has a mass of 38.5 kg when empty. Each tennis ball has a mass of 56.7 g. A coach has set the machine to launch balls horizontally with a speed of 52.0 m/s. He forgot to set the brakes on the machine. If rolling friction between the machine and the court is negligible and all 200 balls are launched, what is the final speed of the machine?

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Amal Jeeva
Amal JeevaLv10
30 Nov 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A wheeled cart sits stationary on a track. The cart has a
funnel mounted on its top, and a steel ball sits in thefunnel,
as shown. Inside the funnel is a spring launcher which fires
the ball straight up. Thus when launched, the ball goes up and thenfalls back
into the funnel.
The time from the launch until the balls fall back into the funnelis t. The vertical speed
of the launched ball when it leaves the funnel is v0.
The mass of the cart, including the funnel and spring launcher, isM. The mass of the steel
ball is m. Assume that air resistance and friction are negligible.Assume that the mass of the wheels
of the cart is negligible compared to M. Assume that the track isalways long enough for
the cart to be on it between when the ball is launched and when itreturns.
PART A:
What is t, the time from the ball being launched until it fallsback into the funnel?
PART B:
Now the cart is moving to the right
with constant speed V. The ball is
launched and the cart continues
moving with speed V. When the ball returns to the same initialheight above the track, does it land in the funnel, to the rightof
the funnel, or to the left of the funnel?
PART C:
If your answer to B was that the ball lands in the funnel, showthat your answer is correct.
For any other answer, what is the distance from the center of thefunnel to the center of
the ball when the ball returns to the same initial height above thetrack?
PART D:
A constant force F is exerted on the
cart. When the cart’s speed is V, the ball
is launched. When the ball returns to the
same initial height above the track, does
it land in the funnel, to the right of the
funnel, or to the left of the funnel?
PART E:
If your answer to D was that the ball lands in the funnel, showthat your answer is correct.
For any other answer, what is the distance from the center of thefunnel to the center of
the ball when the ball returns to the same initial height above thetrack?
PART F:
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which is at an angle ? to the horizontal.
When the cart’s speed is V, the ball is
launched. When the ball returns to the same
initial perpendicular distance above the
track, does it land in the funnel, to the right
of the funnel, or to the left of the funnel?
PART G:
If your answer to F was that the ball lands in the funnel, showthat your answer is correct.
For any other answer, what is the distance from the center of thefunnel to the center of
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An 85.0 kg baseball player who has leapt vertically intotheair to catch a line drive catches the ball as it isheadedhorizontally directly into his glove. The ball has a massof145 g and is headed perpendicular to his arm at 52.0 m/sjustbefore he catches it.
Just after he catches the ball with hisarmextended horizontally, what is the player's angular speed aboutavertical axis through his head and feet, assuming that hewasstationary at the instant he caught it? To make thecalculationsreasonable, you can model the player's body as auniform solidcylinder of mass 73.0 kg and diameter 35.0 cm andhisarms as thin 6.00 kg rods, each 70.0 cm long, pivotingaround avertical axis through his center.

hi,



i have 5 questions i need the
complete solutions with their final results. is there anyonecouldhelp
me, i would appreciate that.







1)
A 0.12-kg ball is moving at 6 m/s when it is hit by a bat,causingit to reverse direction and have a speed of 14 m/s. What isthechange in the magnitude of the momentum of the ball?








2)

Alex throws a 0.15-kg rubber ball down onto the floor. Theball'sspeed just before impact is 6.5 m/s, and just after is 3.5m/s. Ifthe ball is in contact with the floor for 0.025 s, what isthemagnitude of the average force applied by the floor ontheball?







3)

Lonnie pitches a baseball of mass 0.20 kg. The ball arrives athomeplate with a speed of 40 m/s and is batted straight back toLonniewith a return speed of 60 m/s. If the bat is in contact withtheball for 0.050 s, what is the impulse experienced by theball?








4)

A ball with original momentum +4.0 kg?m/s hits a wall andbouncesstraight back without losing any kinetic energy. The changeinmomentum of the ball is:







5)

A machine gun is attached to a railroad flatcar that rollswithnegligible friction. If the railroad car has a mass of 6.25 ?104kg, how many bullets of mass 25 g would have to be fired at 250m/soff the back to give the railroad car a forward velocity of0.5m/s?







thank you in advance

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