Answer:
1. In a coal-fired power plant, chemical energy is first converted to thermal energy. TRUE.
The chemical energy in the coal is converted to thermal energy when the coal is burnt to produce steam.
2. In a coal-fired power plant, approximately 2/5 of original energy in the coal is lost to heat. FALSE.
Approximately 3/5 of the original energy is lost not 2/5 so this statement is false.
3. The molecules in cold air move faster than in hot air. FALSE.
Molecules with more heat move faster than molecules with less. Molecules in cold air therefore, will move slower than molecules in hot air.
The paragraph is going to be your responsibility but I can provide the pros and cons.
Advantages include the fact that Uranium is a plentiful resource, it is relatively clean, and it takes very little resources to make power.
However disadvantages include radioactive byproducts which need longtime storage. Uranium is also a nonrenewable resource, meaning it can run out. Additionally safety issues regarding melt downs are a major concern.
. In 1 hour 2400 kilowatts are used. In 2 hours a total of 4800 kilowatts are used.
We know that force equals mass times acceleration, so substitute in the known values and solve.
