which of the following contains the most energy: a. 90 gallons of gasoline b. 2

Question

which of the following contains the most energy: a. 90 gallons of gasoline b. 2 barrels of crude oil c. 10,000 cubic feet of natural gas d. one-half ton of bituminous coal ------------------------------------------ What is the purpose of the Human Development Index? a. to rank countries by their economic growth b. to assess the development of different countries based on their people and capabilities c. to determine which countries have the highest standard of living d. to calculate the per capita GDP for each country ------------------------------------------- A coal-powered electric generating facility transforms the chemical energy of coal to the electrical energy delivered to your home with an overall efficiency of 35%. This is an example of: a. the law of the conservation of energy b. the conversion of energy c. energy conservation d. a conversation about energy ------------------------------------------- The largest oil tankers can contain two million barrels of crude oil. Roughly, how many tons of coal contain the same amount of energy? a. 500 b. 5000 c. 500,000 d. 5,000,000 ------------------------------------------- How much work is required to increase the velocity of a 4 kg car from rest to 5 m/sec? a. 10 joules b. 20 joules c. 50 joules d. 100 joules e. 200 joules

Explanation / Answer

here

the work done = change in the kinetic energy

the car is moving from rest to 5m/s

so the work done to increase velocity to 5m/s is

W = Kf - Ki

W = 0.5 * m * v^2 - 0.5 * m * u^2

W = 0.5 * 4 * 5^2 - 0.5 * 4 * 0

W = 50 joules

so the correct option is C) 50 J

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