A lever does 722 J of work and the person using the lever applies 892 J of work. What is the efficiency of the lever?

The transfer of heat through the movement of a gas or liquid a. convection b. conduction c. radiation

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

Acapacitor is storing energy of 3 joules with a voltage of 50 volts across its terminals. a second identical capacitor of the same value is storing energy of 1 joule. what is the voltage across the terminals of the second capacitor?