Aroller coaster will accelerate its riders from rest to 33.5m/s in 4.00 seconds. (a) what is the magnitude of the average acceleration of a rider? (b) what is the average net force on a 45.0 kg rider during these 4.00 seconds?

Anybody wanna ? (picture included? )

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.)

On a geologic map, if the contacts between sedimentary rock units form a bull’s-eye pattern of concentric circles, with the youngest unit in the center, the underlying structure is a(n)