Please help me I can't afford to fail this class Two blocks, at 4.0 kg and 5.0 kg, are suspended from the ceiling by a piece of string. What is the tension in the string? Please explain with steps.

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Consider a small frictionless puck perched at the top of a fixed sphere of radius r. if the puck is given a tiny nudge so that it begins to slide down, through what vertical height will it descend before it leaves the surface of the sphere? [hint: use conservation of energy to find the puck's speed as a func e conservation of energy to find the puck's speed as a function of its height at what value of this normal force does the puck leave the sphere? ] here on the puck.