Question

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms resting on the armrests. The chair weighs 100 N. Each armrest exerts an upward force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What force does the floor exert on his feet?

Answer 1

net weight=700N force on the floor.
forceonfloor=feet+chair+armrests
feedforce=700-100-25 (assuming the 25 covers both arms)
feet force=575 N

Answer 2

A man who weighs 600 N is sitting in a chair with his feet on the floor and arms
force of 25.0 N on his arms, and the seat exerts an upward force of 500 N. What
resting on the armrests. The chair weighs 100 N. Each armrest exerts and upward
force does the floor exert on his feet?

Answer 3

The figure shows two particles A and B, of mass m kg and 0.4 kg respectively,
to a line of greatest slope of the plane. The particle B hangs freely below P. The
system is released from rest with the string taut and B descends with acceleration
plane inclined at 30o to the horizontal. The string passes over a small light smooth
connected by a light inextensible string. Initially A is held at rest on a fixed smooth
pulley P fixed at the top of the plane. The section of the string from A to P is parallel
1/5 g.