A photographic flash unit has 0.0001F capacitor which is charged up by small 22.5v battery. How much energy may be discharged?

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy

In a good thermo flask the main cause of heat loss is

Which of these metals are magnetic?