How does the electric potential energy between two positively charged particles change if the distance between them is tripled? a. it is reduced by a factor of 9.

b. it is increased by a factor of 9.

c. it is increased by a factor of 3.

d. it is reduced by a factor of 3.

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

When a vertical beam of light passes through a transparent medium, the rate at which its intensity i decreases is proportional to i(t), where t represents the thickness of the medium (in feet). in clear seawater, the intensity 3 feet below the surface is 25% of the initial intensity i0 of the incident beam. what is the intensity of the beam "10" feet below the surface? (give your answer in terms of i0. round any constants or coefficients to five decimal places.)

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?