Calculate the work required to lift the coaster to the top of the 1st hill & determine the amount of power used to get the roller coaster to the top of the second hill if it takes 2.5 seconds to do so

Explain why electric current cannot exist if a current doesn't have a voltage source.

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc

Which type of energy is transferred by convection currents?