Question

The earing of a lady is 5 cm long. She sits in a merry-go round moving at 4 ms^-1 in a circle of radius 2 ra. The time period of oscillations is nearly

• A. 0.6 s
• B. 0.4 s
• C. 0.8s
• D. None of these

Answer 1

Answer: (B)

0.4 s

Answer 2

T = $2 \pi \sqrt { \sqrt { g ^ { 2 } + \left( \frac { v ^ { 2 } } { R } \right) ^ { 2 } } }$

= 0.4 s (nearly)