Question

In the 19th century James Joule, an English scientist, was the first to recognize the mechanical equivalent of heat as a specific form of the general rule of the conversion of one form of energy to another.

Which fact can be explained with the help of this law?
Responses
A burning a fuel releases heatburning a fuel releases heat
B heating a block of ice causes it to meltheating a block of ice causes it to melt
C a piece of iron glows red hot in a furnacea piece of iron glows red hot in a furnace
D wood rubbed against a rough surface feels hotwood rubbed against a rough surface feels hot

Answer 1

D

Rubbing wood produces heat by friction — mechanical work is converted into internal (thermal) energy. This is the classic demonstration of Joule's mechanical equivalent of heat.