<p>I have a lot of trouble w/ this section. It'd be really helpful if you can help me.</p>
<p>Let R be the region between y=x and y=x^(1/2)</p>
<p>You have to set up an integral for these questions.</p>
<ol>
<li><p>A spring is stretched 4 units, requiring 8π units of force. Find the work done in stretching in from its natural length to 1 unit.</p></li>
<li><p>Find the work done emptying a 1 by 1 by 1 box full of fluid of density pi if the fluid needs to just be pumped over the top. Measure y from the top.</p></li>
</ol>
<p>Thank again:)</p>