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3. A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). A) What is the period of the disk in seconds when it's at its final spinning rate? B) What is its angular speed in rad/s when it's at its final spinning rate? C) Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s? D) How many revolutions does the disk go through during this spin-up process? E) Which is bigger, the centripetal force felt by a dust particle stuck to the edge of the disk halfway through its spin-up or the centripetal force felt by an identical dust particle stuck halfway to the edge of the disk when it's at full speed?

3. A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). A) What is the period of the disk in seconds when it's at its final spinning rate? B) What is its angular speed in rad/s when it's at its final spinning rate? C) Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s? D) How many revolutions does the disk go through during this spin-up process? E) Which is bigger, the centripetal force felt by a dust particle stuck to the edge of the disk halfway through its spin-up or the centripetal force felt by an identical dust particle stuck halfway to the edge of the disk when it's at full speed?

College Physics
College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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please answer parts d and e
3. A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). A) What is the period of the disk in seconds when it's at its final spinning rate? B) What is its angular speed in rad/s when it's at its final spinning rate? C) Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s?? D) How many revolutions does the disk go through during this spin-up process? E) Which is bigger, the centripetal force felt by a dust particle stuck to the edge of the disk halfway through its spin-up or the centripetal force felt by an identical dust particle stuck halfway to the edge of the disk when it's at full speed?
Transcribed Image Text:3. A typical hard disk in a desktop computer is a uniformly solid, 400 gram disk 3.5 inches in diameter, and takes 70 milliseconds to spin from rest up to a frequency of 7200 revolutions per minute (r.p.m.). A) What is the period of the disk in seconds when it's at its final spinning rate? B) What is its angular speed in rad/s when it's at its final spinning rate? C) Assuming it is constant throughout this spin-up process, what is the angular acceleration of the disk in rad/s?? D) How many revolutions does the disk go through during this spin-up process? E) Which is bigger, the centripetal force felt by a dust particle stuck to the edge of the disk halfway through its spin-up or the centripetal force felt by an identical dust particle stuck halfway to the edge of the disk when it's at full speed?
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