25.
A knife is being sharpened on a rotating sharpening-stone. A spark flies off and lands on the
operator's hand. The spark is a very hot, very small piece of metal. The operator feels nothing.
What does this show about the piece of metal?
A
It has a high thermal capacity.
B
C
It has a low thermal capacity.
It is a good conductor of heat.
D
It is a poor conductor of heat.