Why do asteroids and comets differ in composition?.

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

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.)