The moon ariel orbits uranus at a
distance of 1.91 x 10^8 m once every
2.52 days. use that data to calculate
the mass of uranus.
[? ] x 10^[? ]kg

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.