What causes the apparent retrograde motion of the planets?.

"why is graphite used instead of gold or copper wires to conduct electricity in very hot situations such as an industrial kiln? " that's the question, but the thing is, i don't even understand what an "industrial kiln" xd assistance would be < 3

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

If steel is more dense that lake water, why can a boat float