Physics-
General
Easy
Question
A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated with rotation is -
- 2/5
- 2/7
- 3/5
- 3/7
The correct answer is: 2/7
Total energy
K = KR + KT = 
I2 + mv2
= 
2 + mr22
= 
mr22 + mr2 2 = 
mr22
Now, rotational kinetic energy
KR = I2 = mr22
= 
= 
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