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

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Which of the following is a measure of the amount of light a star directly emits?               a.  luminosity    b.  intensity    c.  wavelength    d.  brightness

Aspecified volume of space contains an electric field for which the magnitude is given by e=e0cos(ωt). suppose that e0 = 20 v/m and ω = 1.0 × 107 s−1. part a what is the maximum displacement current through a 0.80 m2 cross-sectional area of this volume? express your answer with the appropriate units. idisp, max i d i s p , m a x = nothing nothing request answer part b how would this area have to be oriented relative to the electric field to get this maximum displacement current?