DC -- Conservation of Energy

According to the Law of Conservation of Energy, "Total energy is constant in any process. It may change in form or ________, but the total remains the same."

• differ in the initial and final total

• be measured using variable units

• change the units of measurement

• be transferred from one system to another

What are the two major types of energy we have studied so far in this unit?

• conservative and nonconservative energy

• mechanical energy and energy transferred by work done by nonconservative forces

• mechanical energy and electrical energy

• kinetic energy and potential energy

Which variable represents all other forms of energy not included in mechanical energy or nonconservative forces?

• OE

• KE + PE

• Wnc

• =

The oxidation of food when a person eats is considered which type of energy?

• OE

• KE

• PE

• W_nc

Which type of energy is obtained by converting small amounts of mass into useable energy?

• nuclear

• electrical

• kinetic

• gravitational

Internal mechanical energy from random motion of atoms.

• potential energy

• radiant energy

• electrical energy

• thermal energy

What type of machine is pictured in the reading as an example of solar energy being converted into electrical energy?

• rooftop solar panels on a house

• solar-powered aircraft

• solar-powered battery charger for phones

• solar-powered car

According to the table in the reading, which amount is nearest to the amount of energy released by a supernova?

• 10^-80

• 10⁶⁸

• 10⁴⁴

• 10³⁷⁷

Which term is used to describe how well useful energy is obtained in a process?

• Conservatism

• Thermal conversion

• Efficiency

• Mechanics

In a coal-fired power plant, about 40% of the chemical energy in the coal becomes useful electrical energy. What happens to the other 60%?

• transformed into kinetic energy

• stored in batteries

• captured by transformers and used in motors

• released to the environment as heat