Physics
ladymoy20
2

A 75.0 kg person stands on a scale in an elevator. (a) What does the scale read (in N and in kg)when the elevator is at rest?

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(1) Answers
karla519

The person's weight is  (mass) x (gravity) = (75 kg) x (9.8 m/s²) = 735 newtons. When the elevator is at rest, or moving up or down at a constant speed, the scale reads 735 newtons. When the elevator starts moving upward from rest, or moving down but getting slower, the scale reads a higher number of newtons. When the elevator starts moving downward from rest, or moving up but getting slower, the scale reads a smaller number of newtons. A properly marked scale will never read anything in kilograms, because 'kilogram' is a unit of mass, not force or weight.

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