Question

A person pushes on a 74 kg refrigerator by a horizontal force of 215 N. (Assume the push is in the +x-direction.)

#1) If the coefficient of static friction is 0.65, what are the magnitude (in N) and the direction (in degrees counterclockwise from the +x-axis) of the force of the static friction? Does the person move the refrigerator?

#2) What is the magnitude (in N) of the largest push that the person can apply to the refrigerator just before it begins to move?

#3) Two objects of masses m₁ = 740 kg and m₂ = 280 kg are placed d₁₂ = 0.55 m from each other. A third object of mass m₃ = 76.0 kg is placed between them.

a) Find the net gravitational force (in N) on m₃ by m₁ and m₂ when it is midway between them. (Enter the magnitude.)

b) Is there any position in which m₃ experiences zero net force from m₁ and m₂? (Give your answer as distance in metres between m₁ and m₃. If no such position exists, simply say that there is NONE.

Answer 1