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Q. A 0.45 kg ball, attached to the end of a horizontal cord, is rotated in the circle of radius 1.3 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 75 N, what is the maximum speed ball can have?

Q. You are trying to slide a refrigerator across a horizontal floor. The mass of the refrigerator is 188kg, and you require to exert a force of 347N to make it just begin to move. What is the coefficient of static friction between floor and refrigerator?

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Category:- Physics
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