When an acrobat hangs motionless from a pair of rings
A. she has no measurable weight.
B. her weight depends on the angles the ropes make with the ceiling.
C. her weight is reduced by the upward force the rings exert on her.
D. her weight is increased by the upward force the rings exert on her.
E. she exerts a gravitational force on the Earth that is equal to the sum of the forces the rings exert on her.
Answer: E
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