The refrigerator has a weight of 180 lb and rests on a tile floor for which μs = 0.25. I...

The refrigerator has a weight of 180 lb and rests on a tile floor for which μ_s = 0.25. If the man pushes horizontally on the refrigerator in the direction shown, determine the smallest magnitude of horizontal force needed to move it. Also, if the man has a weight of 150 lb, determine the smallest coefficient of friction between his shoes and the floor so that he does not slip.