21-30 Flashcards
What is the typical power (Watt = Joule per second) used by a human body of an adult? Hint: A McDonald’s Big Mac combo has about 1 kWh and two Big Mac combos provide enough daily energy required for an average adult.
100 W
As of 2023, the most fuel-efficient aircrafts are Boeing 787 and Airbus 350, both having a fuel mileage of 100 miles per gallon jet fuel per passenger (given that the flight is full). The longest flight route, which is from New York City to Singapore, has about 10,000 miles. If 10 kg of CO2 is emitted per gallon, what is the total emission of CO2 per passenger of this flight?
1,000 kg
The efficiency of electricity generation from conventional coal-fired power plant is
20–30%.
The efficiency of electricity generation from a natural gas-based power plant is
40–50%.
California has one of the most expensive electricity prices in US because
it taxes a premium to minimize emissions of pollutants.
The prices of transportation fuel (e.g. gasoline and diesel) in US are volatile because
the transportation fuel is mainly derived from imported petroleum.
After 2014, the gasoline prices in US dropped because
US had excess oil from fracking.
When burning fossil fuels, energy is released from the chemical bonds between
C—H
According to the author, Prof. Michael McElroy, which of the following is an ultimate source of energy used on Earth?
Fusion energy
Which of the following is a secondary energy source?
Electricity
