
Concept explainers
The metric unit of a joule (J) is a unit of _
a. potential energy.
b. work.
c. kinetic energy.
d. any of the above.

The parameter which has unit of Joule, from the following options.
Potential energy
Work
Kinetic energy
Any of the above
Answer to Problem 2AC
Solution:
Option (d) is correct.
Explanation of Solution
Introduction:
According to the concept of mechanical work, net work is done by an external force, if there is a net displacement in the same direction in which the force is applied.
Mathematically, work can be defined as:
Here,
The metric unit for Work is
The kinetic energy of a body is the energy possessed by a body due to its motion. Example: Energy by a moving car, flowing water.
Mathematically, it is expressed as:
Here,
The potential energy of a body is the energy possessed by a body due to its relative position. Ex: A car on a high mountain possesses potential energy due to the suitable height from the ground level.
Mathematically, it is expressed as:
Here,
Explanation:
Reason for the correct option:
The unit for kinetic energy can be derived as follows:
Consider mass
Substitute
Hence, Joule is a unit for kinetic energy.
Consider the expression for work.
Consider the force as
Substitute
Hence, Joule is a unit for work.
The unit for potential energy can be derived by
Since
Joule is also the unit for potential energy.
So all options (a), (b) and (c) are true therefore option (d) is the correct choice.
Hence, option (d) is correct.
Justify reasons for the incorrect statements:
Since all options (a), (b) and (c) are true therefore option (d) is the correct choice.
Hence, option (a), (b) and (c)are incorrect choice.
Conclusion:
Joule is unit for Work, Kinetic energy and Potential Energy.
Want to see more full solutions like this?
Chapter 3 Solutions
Physical Science
- Discuss the differences between the Biot-Savart law and Coulomb’s law in terms of their applicationsand the physical quantities they describe.arrow_forwardExplain why Ampere’s law can be used to find the magnetic field inside a solenoid but not outside.arrow_forward3. An Atwood machine consists of two masses, mA and m B, which are connected by an inelastic cord of negligible mass that passes over a pulley. If the pulley has radius RO and moment of inertia I about its axle, determine the acceleration of the masses mA and m B, and compare to the situation where the moment of inertia of the pulley is ignored. Ignore friction at the axle O. Use angular momentum and torque in this solutionarrow_forward
- A 0.850-m-long metal bar is pulled to the right at a steady 5.0 m/s perpendicular to a uniform, 0.650-T magnetic field. The bar rides on parallel metal rails connected through a 25-Ω, resistor (Figure 1), so the apparatus makes a complete circuit. Ignore the resistance of the bar and the rails. Please explain how to find the direction of the induced current.arrow_forwardFor each of the actions depicted, determine the direction (right, left, or zero) of the current induced to flow through the resistor in the circuit containing the secondary coil. The coils are wrapped around a plastic core. Immediately after the switch is closed, as shown in the figure, (Figure 1) in which direction does the current flow through the resistor? If the switch is then opened, as shown in the figure, in which direction does the current flow through the resistor? I have the answers to the question, but would like to understand the logic behind the answers. Please show steps.arrow_forwardWhen violet light of wavelength 415 nm falls on a single slit, it creates a central diffraction peak that is 8.60 cm wide on a screen that is 2.80 m away. Part A How wide is the slit? ΟΙ ΑΣΦ ? D= 2.7.10-8 Submit Previous Answers Request Answer × Incorrect; Try Again; 8 attempts remaining marrow_forward
- Two complex values are z1=8 + 8i, z2=15 + 7 i. z1∗ and z2∗ are the complex conjugate values. Any complex value can be expessed in the form of a+bi=reiθ. Find θ for (z1-z∗2)/z1+z2∗. Find r and θ for (z1−z2∗)z1z2∗ Please show all stepsarrow_forwardCalculate the center of mass of the hollow cone shown below. Clearly specify the origin and the coordinate system you are using. Z r Y h Xarrow_forward12. If all three collisions in the figure below are totally inelastic, which will cause more damage? (think about which collision has a larger amount of kinetic energy dissipated/lost to the environment? I m II III A. I B. II C. III m m v brick wall ע ע 0.5v 2v 0.5m D. I and II E. II and III F. I and III G. I, II and III (all of them) 2marrow_forward
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningAn Introduction to Physical SciencePhysicsISBN:9781305079137Author:James Shipman, Jerry D. Wilson, Charles A. Higgins, Omar TorresPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax College





