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27 Nov 2019

With many how revolutions per minute do you have to whirl a ball ona string in a horizontal circle of radius 0.92 m if the magnitudeof its centripetal acceleration is to be the same as the free-fallacceleration due to gravity, 9.81 m/s2? Do not enter units.

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

Related questions

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the bottom of the container. Suppose the centripetal acceleration of the sample is 5.54 x 103 times as large as the acceleration due to gravity. How many revolutions per minute is the sample making, if it is located at a radius of 2.71 cm from the axis of rotation?

A basketballplayer wants to score a three point shot from the 3 point line. Theball has a circumference of 749 mm, and a mass of 624g. (NBA spec)The three point line is 6.7 m from the goal. The goal is 3.05 mhigh and has a diameter of .45m. The player is 2 m tall and has 1mlong arms and weighs 150N. If he shoots from a height equal to theheight of the rim at the edge of the 3 pointline:

•a) What initial velocity and angle will he need to launch theball into the goal?(hint you choose the angle to find thevelocity)
•b) What acceleration will he and the ball have to make theshot? (over the one meter length of his arms) can be done asmomentum.

c) Over his 1 meter of arm length what work and energy is placedinto the ball?

•d) If there are four revolutions per second of back spin on theball how much rotational energy is there?

•e) How much mechanical energy is there in the ball as the ballis released; (Total Kinetic) linear plus rotational?

•f) What is the angle of opportunity or to what precision mustthe shot be made plus or minus on the horizontal plane, or fromright to left not up and down?

g) What is the angular acceleration is needed to induce the 4rev/sec rotation of the ball, and what centripetal acceleration isdeveloped?

1a. Which of the following statements are IMPOSSIBLE?Choose all that apply.
1
The parked motorcycle had 0 J ofKE. The truck had 7325 J of KE and0kg·m/s of momentum. A ball movingin a circle had 0 N of net forceacting on it. A box had anacceleration of 2109 m/s2while a net force of 888 Nacted on it. Jill exerted 136 N of forcedue east ona cart. As a direct result, the cart exerted 136 N offorce dueeast upon Jill. A fork exerts a greater gravitationalforceupon Earth than Earth exerts upon it.

b. Which of the following statements are IMPOSSIBLE? Choose allthat apply.
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A car drove down the highway with aspeed of -80 mph. A trucktraveled a distance of -27mi. A motorcycle slowed down and hadanacceleration of 3 m/s2. A rock wasthrown straight upinto the air. At the peak, its speed was 9.8m/s. 1 km = 100 m Anobjectmoved a total distance of 19 m and had a total displacementof 18m.

c. Which of the following can have the exact same units asLENGTH?Choose all thatapply.
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energy volume timeimage height momentum distance

d. Which of the following can be measured in OUNCES? Choose allthat apply.
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work pressure kineticenergy centripetal force free fallaccelerationnet force


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