Suppose you have a container filled with iron and sand. you can separate the iron from the sand if you so this is a a) use a magnet; mixture b) melt the sand; mixture c) add baking soda; chemical compound d) dissolve the sand in water; solution

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.