Calculate the energy in kilowatt hours used by a heater that operates continuously for 30 minutes. The heater has a power rating of 3000 W.

What's the definition of sound?

The force a magnet exerts on another magnet, on iron or a similar metal, or on moving charges is A. proportional to the mass of the magnet. B. an electric force. C. a magnetic force. D. proportional to the charge of the magnet.

This type of stretching activities are held for 10-20 seconds to maintain your current level of flexibility. dynamic ballistic static

The potential difference between the terminal of an electrical heater is 60v when it draw a current 4A fron the source. What current will the heater draw if the potential difference is increased to 120v?

How do you find your soul?

Which of the following statements is true? A. Both chemical reaction rates and nuclear decay rates vary with the conditions of the reaction. B. Nuclear decay rates vary with the conditions of the reaction, but chemical reaction rates do not. C.

A star may form a black hole once it cannot?

Kai was 200 meters north of the library when he remembered he had to return some books to the library. It took him 200 seconds to do the round trip. Which best describes Kai's roundtrip?

The engine that powers a crane burns fuel at a temperature of 1500 oC. It is cooled by air at a temperature of 20 oC. The crane is used to lift a 1000 kg steel girder 30 m into the air.

The portion of a light ray that falls on a surface is a/an