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Simple pendulum A swings back and forth at twice the frequency of simple pendulum B. Which statement is correct?

The length of B is four times the length of A.

Pendulum B is twice as massive as A.

Pendulum B is twice as long as A.

The mass of B is four times the mass of A.

When the length of a simple pendulum is tripled, the time for one complete vibration increases by a factor of:

1.4.

1.7.

A particle oscillates with undamped simple harmonic motion.

Which one of the following statements about the acceleration of the oscillating particle is true?

It is least when the speed is greatest.

It decreases as the potential energy increases

It is proportional to the frequency.

It is always in the opposite direction to its velocity

Both pendulum A and B are 3.0 m long. The period of A is T. Pendulum A is twice as heavy as pendulum B. What is the period of B?

0.71T

1.4T.

2T.

Doubling only the mass of a vibrating mass-and-spring system produces what effect on the system's mechanical energy?

Produces no change.

Increases the energy by a factor of four.

Increases the energy by a factor of three.

Increases the energy by a factor of two.