Physics Fundamentals
Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 43P

(a)

To determine

To Find: The force of the ground boy’s feet.

(b)

To determine

To Find: The force that legs exert on upper body.

(c)

To determine

To Find: The force exerted by legs on upper body if his trunk moves downward.

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Two boxes are pushed parallel to an inclined plane along an inclined plane with an angle of 10˚ to the horizontal with a force of 110N. The m1= 5kg and m2= 8.2kg. The coefficient of friction between the boxes and the floor is 0.15. The boxes are made of cardboard which can handle a force of 75 N before bending. By finding the action-reaction force between the boxes, do they break?
A wedge with mass M rests on a frictionless, horizontal tabletop. A block with mass m is placed on the wedge, and a horizontal force F S is applied to the wedge (Fig.). What must the magnitude of F S be if the block is to remain at a constant height above the tabletop?
Calculate the magnitude of the normal force on a 15.2 kg block in the following circumstances.  The block is on a level surface and a force of 165 N is exerted on it at an angle of 40.8° above the horizontal.
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