Where should an object be placed in front of a concave mirror of focal length of 10 cm so that the image is magnified two times

The current in a hair dryer measures 11 amps. the resistance of the hair dryer is 12 ohms. what is the voltage?unit:

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

Write down two additional questions about earth's magnetic field that will make your presentation more informative.