Start and First Hill 1. Calculate the potential energy at point C.
2. How much kinetic energy is needed at point B to reach the top?
3. What must the coaster’s speed be at point B to possess this kinetic energy?
4. If the coaster moves from AÆ B in 8 seconds, what is the rate of acceleration of the coaster?
4a. How much net force is required to produce this acceleration?
4b. If the coaster encounters 300N of frictional force, determine the force applied by the propulsion system.
4c. Complete the freebody diagram below

Agas is contained in a vertical, frictionless piston–cylinder device. the piston has a mass of 3.2 kg and a cross-sectional area of 35 cm2. a compressed spring above the piston exerts a force of 190 n on the piston. if the atmospheric pressure is 95 kpa, determine the pressure inside the cylinder.

Electroplating is a way to coat a complex metal object with a very thin (and hence inexpensive) layer of a precious metal, such as silver or gold. in essence the metal object is made the cathode of an electrolytic cell in which the precious metal cations are dissolved in aqueous solution. suppose a current of 480.ma is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 46.0 seconds. calculate the mass of pure silver deposited on a metal object made into the cathode of the cell. round your answer to 3 significant digits. also, be sure your answer contains a unit symbol. ×10μ

Oxygen and hydrogen gas are at the same temperature t.what is the ratio of kinetic energies of oxygen molecule and hydrogen molecule if oxygen is 16 times heavier than hydrogen.