Chapter U5.14, Problem 4E

Interpretation Introduction

Interpretation: The work done in the lifting a box to 3.8 m if the force given is 45 N is to be calculated.

Concept introduction: Work is the result of force acting through a distance. A force is a pull or push on an object because of interaction with another object. Force is measured in Newton (N). Mathematical expression for work is,

  $\text{Work}\text{=}\text{Force}\times \text{Distance}$

Answer to Problem 4E

The work done in lifting the box is $\text{171}\text{N}\cdot \text{m}$ .

Explanation of Solution

Given, distance is $3.8\text{m}$ and the force applied in lifting the box is $45\text{N}$ . Now use the formula of work.

  $\begin{array}{c}\text{Work}\text{=}\text{Force}\times \text{Distance}\\ \text{=45}\text{N}\times \text{3}\text{.8}\text{m}\\ \text{=171}\text{N}\cdot \text{m}\end{array}$

Conclusion

Product of distance and force gives the work.