A child rolls a ball on a level floor 3.0 m to another child. If the ball makes1

Question

A child rolls a ball on a level floor 3.0 m to another child. If the ball makes17.0 revolutions, what is itsdiameter?


A cyclist accelerates from rest at a rate of 1.00 m/s2.How fast will a point on the rim of the tire (diameter = 68 cm) atthe top be moving after 3.9 s? (Hint:At any moment, the lowest point on the tire is in contact with theground and is at rest


A cooling fan is turned off when it is running at 700 rev/min. It turns 1700 revolutions before it comes to a stop. (a)What was the fan's angular acceleration, assumed constant


An automobile engine slows down from 3000 rpm to 1600 rpmin 3.5 s. (a) Calculate its angularacceleration, assumed constant.

In traveling to the Moon, astronauts aboard the Apollo spacecraftput themselves into a slow rotation to distribute the Sun's energyevenly. At the start of their trip, they accelerated uniformly fromno rotation to one revolution every minute during a 15 min time interval. The spacecraft can bethought of as a cylinder with a diameter of 9.5 m. (a) Determine the angular acceleration.

Explanation / Answer

A cooling fan is turned off when it is running at700 rev/min. It turns 1700 revolutions before it comes to a stop. (a)What was the fan's angular acceleration, assumed constant The fan's acceleration is given by             = [2- o2]/(2) Here = 1700 rev           o =( 700/60) rev/s            =0 Substitute the values.

An automobile engine slows down from 3000 rpm to 1600 rpmin 3.5 s. (a) Calculate its angularacceleration, assumed constant. The angular acceleration is given by       = [-o]/(t) Here o = (3000/60) rev/s           = (1600/60) rev/s           t=3.5s Substitute the values.

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