Calculate and compare the gravitational force and the electrical force between two
protons that are separated by 4.25x 10-15 m
(G = 6.67 x 10" Nm /kg?, e = 1.60 x 10-1°C,
m = 1.67 x 10-27 kg).
=

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?

What is the equation for electrical work?

When the displacement of a mass on a spring is 12a the half of the amplitude, what fraction of the mechanical energy is kinetic energy? at what displacement, as a fraction of a, is the mechanical energy half kinetic and half potential?