Manipal MET2012PhysicsExperimental Physics
The length of the second's pendulum is decreased by 0.3 cm when it is shifted to Chennai from London. If the acceleration due to gravity at London is 981 ~cm / s ^2 , the acceleration due to gravity at Chennai is
Options
- A981 ~cm / s ^2
- B978 ~cm / s ^2
- C984 ~cm / s ^2
- D975 ~cm / s ^2
Correct answer
B. 978 ~cm / s ^2
Step-by-step solution
L₁= g₁ T^2 4 ^2 = g₁ ^2 ; L₂= g₂ T^2 4 ^2 = g₂ ^2 Since, length is decreased, g₂ is less than g₁ . L₁-L₂= g₁-g₂ ^2 or (L₁-L₂ ) ^2=g₁-g₂ or 0.3 10=g₁-g₂ g₂=981-3=978 ~cm / s ^2