You see, the specific heat of lead is 129 J/kg*K, so if the mass of the piece of lead would be 1 kg, I would need 1290 Joules to make the lead raise its temperature by 10 degrees Kelvin. But the main problem is that I DON'T know the mass and I need to get the height of dropping the piece, not...
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...