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Homework Help: physics!

Posted by monica on Wednesday, February 2, 2011 at 11:56pm.

A student is about to do a push-up. Her
center of gravity lies directly above P on the
floor, which is 1.1 m from her feet and 0.4 m
from her hands.
If her mass is 55 kg, what is the force exerted by the floor on her hands? The acceleration of gravity is 9.81 m/s
2
.

• physics! - drwls, Thursday, February 3, 2011 at 1:46am

  While stationary, the total moment about an axis through her toes is zero.
  
  Her hands are 1.5 m from her toes. Her center of mass is 1.1 m from her toes.
  
  F*1.5 - M*g*1.1 = 0
  
  F = (1.1/1.5)M*g = 395 Newtons
  

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