Is the mass per unit volume of a material. a) volume b) size c) weight d) density

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

What are the north and south poles of a solenoid change with?