Which of these did Count Rumford demonstrate?
a. That heat was only generated by fire, light, and sunshine.
b. That caloric, or heat fluid, is a gas.
c. That heat is a substance found in fire that is available only in limited amounts in every object.
d. That heat can be generated in any amount wanted and was therefore not a material substance.
e. That heat is a form of energy.
Question 2
To investigate the nature of heat produced during the boring process, Count Rumford placed a dull boring tool and a brass cylinder in a barrel filled with cold water. The boring tool was forced against the bottom of the cylinder and rotated by two horses as shown in this figure. What would happen if the water used to cool the bore of the cannon were not replenished while the horses continued to provide mechanical energy?
a. The temperature of the water would decrease as the temperature of the cannon bore increases.
b. The temperature of the water would increase until it boils and evaporates.
c. It would cause less resistance and the horses will not be able to transmit as much energy though work.
d. Only a limited amount of heat can be extracted from the apparatus during a given session, so whether all the water boils away depends on how much water is used.
e. Work and heat are distinct, so there is no significant effect on the water.
Which wavelengths of light are most effective at photosynthesis?
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