If you double the mass but don't change the net force what is the result on the acceleration

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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.)

Match each scenario to the form of energy it represents