Does a horseshoe go on the hoof or around it

Find the volume of the ellipsoid x^2+y^2+5z^2=36.

Which transition by an electron will release the greatest amount of energy? oa ob oc od

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