1.Choose all that are true for pendulums. (multiple answers) Pendulums go through the equilibrium once every period.
For pendulums, the period is dependent on the mass.
The longer the string, the longer the period. The period of a pendulum is dependent on gravity.

2.Choose all that are true for springs. (multiple answers)
The more mass, the longer the period.
The bigger the spring constant, the shorter the period.
The more mass, the shorter the period.
The bigger the spring constant, the more rigid the spring.

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