Question

The ratio of rotational and translatory kinetic energies of a sphere is:

• A. 2/9
• B. 2/7
• C. 2/5
• D. 7/2.

Answer 1

Answer: (C)

2/5

Answer 2

$= \frac { \frac { 1 } { 2 } m v ^ { 2 } \frac { K ^ { 2 } } { R ^ { 2 } } } { \frac { 1 } { 2 } m v ^ { 2 } } = \frac { K ^ { 2 } } { R ^ { 2 } } = \frac { 2 } { 5 }$