DanaeWiersteiner663 DanaeWiersteiner663

07-10-2015
Physics

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A 20 kg crate of books is at rest on a table. what is the normal force on the books?

Respuesta :

07-10-2015

The weight of 20 kg is

(mass) x (gravity) =

(20 x 9.8) = 196 newtons, downward.

There must be a force of 196 newtons upward on the mass.
Otherwise the mass is accelerating either up or down.

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