6.A seconds pendulum has time period 2 s. The spherical bob which is empty has mass of 50 g. This is replaced by another solid bob of same radius but having mass of 100 g. The new time period will be:

7.A pendulum suspended from the ceiling of a train has a period T when the train is at rest. When the train is accelerating with a uniform acceleration, the period of oscillation will

8.The displacement equation of a particle in simple harmonic motion in one time period is

9.The length of the seconds pendulum on the surface of Earth is 1 m. Its length on the surface of Moon, where g is 1 / 6 th the value of g on the surface of Earth, is

10.Two tuning forks when sounded simultaneously give one beat each 0.4 second. What is the difference of the frequencies ?