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SAT® Subject Test in Physics

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Moderate

Two Girl Swingers

SATPHY-KJLVQA

A $35.0\ kg$ girl is swinging on a large swing with very long light-weight ropes holding it. Another $35.0\ kg$ girl jumps on while the first girl is swinging, and sits right next to the first girl.

How does the new period of the swinging system with two girls compare to the old swinging system with just one girl?

A

The period of the new system is four times as great as the period of the old system.

B

The period of the new system is one-fourth as great as the period of the old system.

C

The period of the new system is twice as great as the period of the old system.

D

The period of the new system is one-half as great as the period of the old system.

E

The period of the new system is about the same as the period of the old system.