How much heat energy in Joules does it take to raise 0.5 kg of lead 5 degrees?

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?

Place me with this question is my last question