Energy input remains constant and voltage remains the same in a circuit, but current decreases. which must be happening?

a- the resistance is increasing.
b- the resistance is decreasing.
c- there is too much power in the current

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?

Would it be correct to say the doppler effect is the apparent change in the speed of a wave due to the motion of the source? be sure to fully explain your position using at least 3 complete content related sentences.