Why are chemical changes considered "unseen"?

The magnetic field inside a superconducting solenoid is 4.50 t. the solenoid has an inner diameter of 6.20 cm and a length of 26.0 cm. determine (a) the magnetic energy density in the field and (b) the energy stored in the magnetic field within the solenoid.

The amount of potential energy possessed by an elevated object is equal to what?

Identify the type of heat transfer occurring when chocolate melts in your hand