Agarage door opener has a power rating of 350 watts. if the door is in operation for 30 seconds, how many joules of energy are used? (hint: remember that 1 watt = 1 joule/sec)

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

What type of relationship exists between the length of a wire and the resistance, if all other factors remain the same? o a. resistance is directly related to length. ob. resistance is directly related to the square of the length. c. resistance is inversely related to the length. d. resistance is inversely related to the square of the length. reset next

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.