Question

One project after deviation from its path, starts moving round the earth in a circular path at radius equal to nine times the radius at earth R, its time period will be

• A. $2 \pi \sqrt { \frac { R } { g } }$
• B. $27 \times 2 \pi \sqrt { \frac { R } { g } }$
• C. $\pi \sqrt { \frac { R } { g } }$
• D. $8 \times 2 \pi \sqrt { \frac { R } { g } }$

Answer 1

Answer: (B)

$27 \times 2 \pi \sqrt { \frac { R } { g } }$

Answer 2

$= 2 \pi ( 9 ) ^ { 3 / 2 } \sqrt { \frac { R } { g } }$ $r = 9 R$ (given)].