A 10 gram pencil is dropped to the ground. Assuming that the pencil is in free fall, what would be the force with which the pencil drops to the ground? (You must
include the SI unit)

What is the scientific definition of energy that relates to work

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.)

Could we see a galaxy that is 20 billion light-years away?