First of all, I have to say hello to all of you. I am from a foreign country so my English isn't so good. So my problem will probably seem very funny and easy to you, but it's very hard to me. I've got absolutely no idea about it and I'd be very thankful if you could help me out. So here it is. I need to find out the height, from which a piece of lead was dropped down to Earth and it's temperature grew up by 10 Celcius degrees (50 Fahrenheit degrees). We assume that only the internal energy of the piece of lead grew up and that internal energy of Earth didn't. Cheers.