Why do power tools with a plastic case not have a 3-prong plug but metal encased tools have (or should have) 3-prong plugs?
What will be an ideal response?
The third wire (large round prong plug) connects to ground and grounds the metal case. A hot wire accidentally coming in contact with the case will blow a fuse. A plastic case is insulation and does not need to be grounded for safety.
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What do astronomers mean by the Big Bang?
A) the event that marked the beginning of the expansion of the universe B) a gigantic explosion that blew all the galaxies in the universe to smithereens C) the explosion of a massive star at the end of its life D) the event that marked the birth of our solar system
The unit kilowatt-hour is a unit of
A) energy. B) momentum. C) power. D) time.
Dikes are examples of ______________ plutons
a. discordant b. concordant c. recordant d. precordant
A system consists of two very large thermal reservoirs in contact with each other, one at temperature 300°C and the other at temperature 200°C
When 600 J of heat transfers from the 300°C reservoir to the 200°C reservoir, what is the change in entropy of this system? A) 0.221 J/K B) 1.00 J/K C) 5.00 J/K D) -1.00 J/K E) -2.31 J/K