Chapter MPS, Problem 9.7MPS

To determine

To find: The amount of stretch by a force of 120 pound in spring

Answer to Problem 9.7MPS

The amount of stretch by a force of 120 pound in springis $12\text{inch}$ .

Explanation of Solution

Given information: The 50 pounds caused spring to stretch five inches.

Calculation:

Consider the equation.

  $\begin{array}{l}F=kx\\ 50=5k\\ k=10\end{array}$

The amount of calories she had is,

  $\begin{array}{l}120=10x\\ x=12\text{inch}\end{array}$

Thus, the amount of stretch by a force of 120 pound in spring is $12\text{inch}$ .