A popular holiday house ornament consists of a little metal fan with horizontal blades, that pivots above a couple of burning candles. As the candles burn, their heat makes the fan spin and little hammers that move with the fan ring several tiny bells. While the decoration runs on heat alone, it won't work when you remove the candles and put it inside a hot, dark oven. It's inability to use the oven's heat is explained by the fact that
A. the candles produced burned gases while the oven contains only hot air.
B. the candle's heat is ordered, while the heat in the oven is completely disordered.
C. the candle flames emit light, while the oven is dark.
D. both a hot region and a cold region are needed in order to convert heat into work.
Answer:D
A popular holiday house ornament consists of a little metal fan with horizontal blades, that pivots above a couple of burning candles. As the candles burn, their heat makes the fan spin and little hammers that move with the fan ring several tiny bells. While the decoration runs on heat alone, it won't work when you remove the candles and put it inside a hot, dark oven. It's inability to use the oven's heat is explained by the fact that
A. the candles produced burned gases while the oven contains only hot air. B. the candle's heat is ordered, while the heat in the oven is completely disordered. C. the candle flames emit light, while the oven is dark. D. both a hot region and a cold region are needed in order to convert heat into work.