Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 6: Problem 8

Which of the following is not a unit of energy? a) newton-meter b) joule c) kilowatt-hour d) \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\) e) all of the above

Short Answer

Expert verified
A) Newton-meter B) Joule C) Kilowatt-hour D) \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\) E) All of the above Answer: E) All of the above

Step by step solution

01

Option A: Newton-meter

The Newton-meter (N.m) is also known as the joule (J), which is the SI unit of energy. A Newton is a unit of force and can be expressed as \(\operatorname{kg} \mathrm{m} / \mathrm{s}^{2}\). When we multiply force by the distance (meter), we get the unit of energy, which is \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\). Hence, the newton-meter is a unit of energy.
02

Option B: Joule

As mentioned in the previous option, the joule (J) is the SI unit of energy and is equal to \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\). Thus, the joule is a unit of energy.
03

Option C: Kilowatt-hour

The kilowatt-hour (kWh) is a unit of energy used in measuring electrical energy. It represents the amount of energy consumed by a device using 1 kilowatt (\(10^{3}\) watts) for 1 hour. A watt is a unit of power, which is equal to one joule per second. To convert kilowatt-hour into joules, we multiply by the number of seconds in an hour and the conversion factor from kilowatts to watts: \(1 \, \mathrm{kWh} = 1 \times 10^{3} \, \mathrm{W} \times 3600 \, \mathrm{s} = 3.6 \times 10^{6} \, \mathrm{J}\). Therefore, the kilowatt-hour is a unit of energy.
04

Option D: \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\)

The unit \(\operatorname{kg} \mathrm{m}^{2} / \mathrm{s}^{2}\) is the same as the unit of the joule, which is the SI unit of energy. Hence, this option is also a unit of energy.
05

Conclusion

After analyzing each option, it is clear that all of the given units are units of energy. Therefore, the correct answer is option E: "all of the above" is not a unit of energy since it implies that not any of the options is a unit of energy, but in fact, all of them are.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

A classmate throws a \(1.0-\mathrm{kg}\) book from a height of \(1.0 \mathrm{~m}\) above the ground straight up into the air. The book reaches a maximum height of \(3.0 \mathrm{~m}\) above the ground and begins to fall back. Assume that \(1.0 \mathrm{~m}\) above the ground is the reference level for zero gravitational potential energy. Determine a) the gravitational potential energy of the book when it hits the ground. b) the velocity of the book just before hitting the ground.

How much mechanical energy is lost to friction if a 55.0-kg skier slides down a ski slope at constant speed of \(14.4 \mathrm{~m} / \mathrm{s}\) ? The slope is \(123.5 \mathrm{~m}\) long and makes an angle of \(14.7^{\circ}\) with respect to the horizontal.

Can a unique potential energy function be identified with a particular conservative force?

A child throws three identical marbles from the same height above the ground so that they land on the flat roof of a building. The marbles are launched with the same initial speed. The first marble, marble \(\mathrm{A}\), is thrown at an angle of \(75^{\circ}\) above horizontal, while marbles \(\mathrm{B}\) and \(\mathrm{C}\) are thrown with launch angles of \(60^{\circ}\) and \(45^{\circ}\), respectively. Neglecting air resistance, rank the marbles according to the speeds with which they hit the roof. a) \(A

A 1.00 -kg block is pushed up and down a rough plank of length \(L=2.00 \mathrm{~m},\) inclined at \(30.0^{\circ}\) above the horizontal. From the bottom, it is pushed a distance \(L / 2\) up the plank, then pushed back down a distance \(L / 4,\) and finally pushed back up the plank until it reaches the top end. If the coefficient of kinetic friction between the block and plank is \(0.300,\) determine the work done by the block against friction.
See all solutions

Recommended explanations on Physics Textbooks

Space Physics

Read Explanation

Fields in Physics

Read Explanation

Physics of Motion

Read Explanation

Linear Momentum

Read Explanation

Work Energy and Power

Read Explanation

Kinematics Physics

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free