How much work is needed to change the speed of a 2375 kg sport utility vehicle from 15.0 m/s to 60 m/s? a. 2.2 MJ O b. 2.7 MJ O c. 2.8 MJ d. 3.1 MJ e. 4.0 MJ

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
icon
Related questions
Question
### Work and Energy Calculation

**Problem:**
How much work is needed to change the speed of a 2375 kg sport utility vehicle from 15.0 m/s to 60 m/s?

**Options:**
- a. 2.2 MJ
- b. 2.7 MJ
- c. 2.8 MJ
- d. 3.1 MJ
- e. 4.0 MJ

**Explanation:**

To solve this problem, we need to calculate the change in kinetic energy of the vehicle because the work done on the vehicle is equal to the change in its kinetic energy. The kinetic energy (KE) of an object is given by:

\[ KE = \frac{1}{2}mv^2 \]

where:
- \( m \) is the mass of the object,
- \( v \) is its velocity.

Let's calculate the initial and final kinetic energies:

1. **Initial Kinetic Energy (KE_initial):**
   \[
   KE_{\text{initial}} = \frac{1}{2} \times 2375 \, \text{kg} \times (15.0 \, \text{m/s})^2
   \]

2. **Final Kinetic Energy (KE_final):**
   \[
   KE_{\text{final}} = \frac{1}{2} \times 2375 \, \text{kg} \times (60.0 \, \text{m/s})^2
   \]

3. **Change in Kinetic Energy (\(\Delta KE\)):**
   \[
   \Delta KE = KE_{\text{final}} - KE_{\text{initial}}
   \]

Finally, the work done is equal to the change in kinetic energy. The correct answer will be one of the given options in megajoules (MJ).

### Practice Exercise:
Try to calculate the exact numerical values using the given formulae to find the correct option. This exercise helps in understanding the application of kinetic energy in real-world scenarios, such as calculating the energy required for accelerating vehicles.
Transcribed Image Text:### Work and Energy Calculation **Problem:** How much work is needed to change the speed of a 2375 kg sport utility vehicle from 15.0 m/s to 60 m/s? **Options:** - a. 2.2 MJ - b. 2.7 MJ - c. 2.8 MJ - d. 3.1 MJ - e. 4.0 MJ **Explanation:** To solve this problem, we need to calculate the change in kinetic energy of the vehicle because the work done on the vehicle is equal to the change in its kinetic energy. The kinetic energy (KE) of an object is given by: \[ KE = \frac{1}{2}mv^2 \] where: - \( m \) is the mass of the object, - \( v \) is its velocity. Let's calculate the initial and final kinetic energies: 1. **Initial Kinetic Energy (KE_initial):** \[ KE_{\text{initial}} = \frac{1}{2} \times 2375 \, \text{kg} \times (15.0 \, \text{m/s})^2 \] 2. **Final Kinetic Energy (KE_final):** \[ KE_{\text{final}} = \frac{1}{2} \times 2375 \, \text{kg} \times (60.0 \, \text{m/s})^2 \] 3. **Change in Kinetic Energy (\(\Delta KE\)):** \[ \Delta KE = KE_{\text{final}} - KE_{\text{initial}} \] Finally, the work done is equal to the change in kinetic energy. The correct answer will be one of the given options in megajoules (MJ). ### Practice Exercise: Try to calculate the exact numerical values using the given formulae to find the correct option. This exercise helps in understanding the application of kinetic energy in real-world scenarios, such as calculating the energy required for accelerating vehicles.
Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Knowledge Booster
Power
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.
Similar questions
Recommended textbooks for you
College Physics
College Physics
Physics
ISBN:
9781305952300
Author:
Raymond A. Serway, Chris Vuille
Publisher:
Cengage Learning
University Physics (14th Edition)
University Physics (14th Edition)
Physics
ISBN:
9780133969290
Author:
Hugh D. Young, Roger A. Freedman
Publisher:
PEARSON
Introduction To Quantum Mechanics
Introduction To Quantum Mechanics
Physics
ISBN:
9781107189638
Author:
Griffiths, David J., Schroeter, Darrell F.
Publisher:
Cambridge University Press
Physics for Scientists and Engineers
Physics for Scientists and Engineers
Physics
ISBN:
9781337553278
Author:
Raymond A. Serway, John W. Jewett
Publisher:
Cengage Learning
Lecture- Tutorials for Introductory Astronomy
Lecture- Tutorials for Introductory Astronomy
Physics
ISBN:
9780321820464
Author:
Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina Brissenden
Publisher:
Addison-Wesley
College Physics: A Strategic Approach (4th Editio…
College Physics: A Strategic Approach (4th Editio…
Physics
ISBN:
9780134609034
Author:
Randall D. Knight (Professor Emeritus), Brian Jones, Stuart Field
Publisher:
PEARSON