Chapter 34, Problem 18PE

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000

Chapter
Section

### College Physics

1st Edition
Paul Peter Urone + 1 other
ISBN: 9781938168000
Textbook Problem

# Using data from the previous problem, find the increase in rotational kinetic energy, given the core’s mass is 1.3 times that of our Sun. Where does this increase in kinetic energy come from?

To determine

The increase in rotational kinetic energy and the source for the increase in kinetic energy.

Explanation

Given:

Frequency =964rev/s

Formula used:

KE = 122I= 25Mr2

Where,

K = Kinetic Energy

I = Moment of Inertia

ω= angular velocity

M= Mass in Kg

Calculation:

KE = 122I= 25Mr2KEi = 12(25Mr2i2=12(25Mr2)(2πf)2= 0.2 x 1

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