a. What is the period and frequency of the pendulum’s motion?
b. How many seconds out of phase with the displacements shown would graphs of the velocity and acceleration be?
c. What is the acceleration due to gravity on the surface of the planet in m/s2? Determine the number of g-forces.

Question

a.	What is the period and frequency of the pendulum’s motion?
b.	How many seconds out of phase with the displacements shown would graphs of the velocity and acceleration be?
c.	What is the acceleration due to gravity on the surface of the planet in m/s2? Determine the number of g-forces.

anonymous · Answer

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anonymous · Answer

It had 5 cycles in 4 sec, so its frequency is 5/4 = 1.25/s   its period is (4/5) = 0.8s.

Displacement is most positive when acceleration most negative, so 180o out of phase.

anonymous · Answer

Out of phase by half a period  0.8s/2 = 0.4 s.

anonymous · Answer

Period proportional to sqrt (L/g)