Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Show that the child’s new kinetic energy of rotation is more than the initial kinetic energy of rotation. How do you account for this increase in kinetic energy?

Q7.13(b)     Show that the child’s new kinetic energy of rotation is more than the initial
                    kinetic energy of rotation. How do you account for this increase in kinetic energy?

Answers (1)

best_answer

The final and initial velocities are given below :

                          E_f\ =\ \frac{1}{2}I_2w_2^2                 and            E_i\ =\ \frac{1}{2}I_1w_1^2 

        Taking the ratio of both we get,       

                                                           \frac{E_f}{E_i}\ =\ \frac{\frac{1}{2}I_2w_2^2}{\frac{1}{2}I_1w_1^2}

or                                                                  =\ \frac{2}{5}\times \frac{100\times 100}{40\times40}

or                                                                   =\ 2.5

Thus the final energy is 2.5 times the initial energy.

The increase in energy is due to the internal energy of the boy.

Posted by

Devendra Khairwa

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Date Sheet 2025 (Out) Live: Class 10, 12 board exam time table at cbse.gov.in; syllabus, sample papers
anam-khan

CBSE Class 12 board exam date sheet 2025 out; exams from February 15 to April 4
anam-khan

When will CBSE Board exam 2025 date sheet be released for Class 10, 12?

Latest Question