The Angle That a Swinging Simple Pendulum Makes with the Vertical

The angle that a swinging simple pendulum makes with the vertical obeys the equation
Θ(t)= (0.150 rad)cos[(2.85 rad/s)t + 1.66].
(a)What is the length of the pendulum?
A)0.15 m
B)0.83 m
C)1.21 m
D)2.02 m
E)It cannot be determined from the information given.
(b)What is the mass of the swinging bob at the end of the pendulum?
A)2.85 kg
B)1.66 kg
C)0.454 kg
D)0.150 kg
E)It cannot be determined from the information given.

Correct Answer:

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