Question

1. how much work is done when an 8 n force moves a block 7m? 2. eva applies 40n force to move her bookcase 3m, how much work did eva do? 3. how far will 490 j of work raise a block weighing 7 n?

Explanation:

Step1: Recall work - formula

The formula for work is $W = F\times d$, where $W$ is work, $F$ is force and $d$ is distance.

Step2: Solve problem 1

Given $F = 8N$ and $d=7m$. Substitute into formula: $W = 8\times7$.
$W = 56J$

Step3: Solve problem 2

Given $F = 40N$ and $d = 3m$. Substitute into formula: $W=40\times3$.
$W = 120J$

Step4: Solve problem 3

Given $W = 490J$ and $F = 7N$. Rearrange formula $W = F\times d$ to $d=\frac{W}{F}$. Substitute values: $d=\frac{490}{7}$.
$d = 70m$

Answer:

1. $56J$
2. $120J$
3. $70m$