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Chapter 7: Q.25CQ (page 259)

What is the difference between energy conservation and the law of conservation of energy? Give some examples of each.

Short Answer

Expert verified

The key difference between energy conservation and the law of conservation of energy is that energy conservation is an effort to reduce the amount of energy consumed, whereas the law of conservation of energy states that the total energy of an isolated system is eternally conserved.

Step by step solution

01

Definition of Concepts

Energy conservation: Energy conservation is an effort to decrease the amount of energy used by an individual or group through reduced activities and/or increasing conversion efficiencies in the performance of a particular task.

Some examples of energy conservation are:

  • Reduce the usage of motor vehicles.
  • Developing and using more efficient devices.
02

Explain the difference between energy conservation and the law of conservation of energy

The law of conservation of energy states that the total energy of an isolated system is eternally conserved.

Some examples of the law of conservation of energy are:

  • When electrical energy is supplied to the incident bulb, most of the electrical energy gets converted into light energy where some part of electrical energy dissipates as thermal energy.
  • When a person tried to push a cart on a rough surface, most of the energy supplied by him is used in increasing the kinetic energy of the cart while some of the energy is used to overcome the friction.

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Most popular questions from this chapter

(a) Use of hydrogen fusion to supply energy is a dream that may be realized in the next century. Fusion would be a relatively clean and almost limitless supply of energy, as can be seen from Table 7.1. To illustrate this, calculate how many years the present energy needs of the world could be supplied by one millionth of the oceans’ hydrogen fusion energy.

(b) How does this time compare with historically significant events, such as the duration of stable economic systems?

In Example 7.7, we calculated the final speed of a roller coaster that descended \(20{\rm{ m}}\) in height and had an initial speed of \(5{\rm{ m}}/{\rm{s}}\) downhill. Suppose the roller coaster had had an initial speed of \(5{\rm{ m}}/{\rm{s}}\) uphill instead, and it coasted uphill, stopped, and then rolled back down to a final point 20m below the start. We would find in that case that it had the same final speed. Explain in terms of conservation of energy.

Consider humans generating electricity by pedaling a device similar to a stationary bicycle. Construct a problem in which you determine the number of people it would take to replace a large electrical generation facility. Among the things to consider are the power output that is reasonable using the legs, rest time, and the need for electricity 24 hours per day. Discuss the practical implications of your results.

Explain why it is easier to climb a mountain on a zigzag path rather than one straight up the side. Is your increase in gravitational potential energy the same in both cases? Is your energy consumption the same in both?

List four different forms or types of energy. Give one example of a conversion from each of these forms to another form.
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