**1.**

The period is expressed as:

$\overline{){\mathbf{T}}{\mathbf{=}}{\mathbf{2}}{\mathbf{\pi}}\sqrt{\frac{\mathbf{L}}{\mathbf{g}}}}$, where L is length and g is the acceleration due to gravity.

1. What is the period of a 693 cm long pendulum with a bob of mass 68.0 kg? Assume the acceleration due to gravity is 9.8 m/s^2.

a. 6.28 hz

b. 5.28 sec

c. 7.47 hz

d. 7.47 sec

2. -Aω^2 cos(ωt) is the expression for:

a. Acceleration

b. Velocity

c. Displacement

d. None of the above

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What scientific concept do you need to know in order to solve this problem?

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