A Person Is Pushing on a Box,exerting a Force of Magnitude

question 22

Multiple Choice

A person is pushing on a box,exerting a force of magnitude P,as shown in the figure.Earth exerts force W on the box.The push is directed at an angle θ below the horizontal,and the box remains at rest.The box rests on a horizontal floor that has some friction with the box.The friction force exerted by the floor on the box is equal to

• A)P sin θ
• B)P cos θ
• C)0
• D)P cos θ + W
• E)P + W

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