The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.70 107) t 2 + (2.15 105) t, where v is in meters per second and t is in seconds. the acceleration of the bullet just as it leaves the barrel is zero. (a) determine the acceleration and position of the bullet as a function of time when the bullet is in the barrel. (use t as necessary and round all numerical coefficients to exactly 3 significant figures.)

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.)

Aplane's average speed between two cities is 600 km/h. if the trip takes 2.5 hours, how far does the plane fly?

What caused magnetic fields? what happens if you keep breaking a magnet in two until you reach a single atom?