Question

A simple pendulum of length $l$ is suspended from the ceiling of a trolley which is moving, without friction, down an inclined plane of inclination . The time period of the pendulum is given by $T=2\pi \sqrt{\frac{l}{g_{eff}}}$ where $g_{eff}$ is given by

• A. g
• B. g sin $\theta$
• C. g cos $\theta$
• D. g tan $\theta$

Answer 1

The correct option is C g cos $\theta$

The correct choice is (b) since the component of the acceleration due to gravity perpendicular to the plane is g cos $\theta$