The marble rolls down a track and around the loop the loop of radius R. The marble has mass m and radius r. What minimum height h must the track have for the marble to make it around the loop the loop without falling off?
A sphere has I of 2/5mr^2
From using Newton's second law, I find the critical velocity to be sqrt(gR).
Using energy conservation, I get the equation
mgh = 1/2mv^2 + 1/2IW + 2Rg

If a clock aboard a space ship traveling at 0.900 c of the speed of light relative to earth chimes once at the beginning of the hour and again when it reads one hour later, how much time would an observer on earth say elapsed between the two chimes?

Arock collection comes from which part of earth?

Suppose that two tanks, 1 and 2, each with a large opening at the top, contain different liquids. a small hole is made in the side of each tank at the same depth 1.57 m below the liquid surface, but the hole in tank 2 has 2.49 times the cross-sectional area of the hole in tank 1. (a) what is the ratio ρ1/ρ2 of the densities of the liquids if the mass flow rate is the same for the two holes? (b) what is the ratio rv1/rv2 of the volume flow rates from the two tanks? (c) at one instant, the liquid in tank 1 is 14.9 cm above the hole. if the tanks are to have equal volume flow rates, what height above the hole must the liquid in tank 2 be just then?