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Problems in Mathematical Analysis.pdf - pwp.net.ipl.pt

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Sec. 12] Apply<strong>in</strong>g Def<strong>in</strong>ite Integrals to Solution of Physical <strong>Problems</strong> 179<br />

1779. A horizontal beam of length / is <strong>in</strong>- equilibrium<br />

due to<br />

a downward vertical load uniformly distributed over the length<br />

of the beam, and of support reactions A and fi(yl==5==-y-j t<br />

directed vertically upwards. F<strong>in</strong>d the bend<strong>in</strong>g moment Mx <strong>in</strong><br />

a cross-section x, that is, the moment about the po<strong>in</strong>t P with<br />

abscissa x of all forces act<strong>in</strong>g on the portion of the beam AP.<br />

1780. A horizontal beam of length / is <strong>in</strong> equilibrium due to<br />

support reactions A and B and a load distributed along the<br />

length of the beam with <strong>in</strong>tensity q = kx, where x is the distance<br />

from the left support and k is a constant factor. F<strong>in</strong>d the bend-<br />

<strong>in</strong>g moment M x <strong>in</strong> cross-section x.<br />

Note. The <strong>in</strong>tensity of load distribution is the load (force)<br />

unit length.<br />

referred to<br />

1781*. F<strong>in</strong>d the quantity of heat released by an alternat<strong>in</strong>g<br />

s<strong>in</strong>usoidal current<br />

dur<strong>in</strong>g a cycle T <strong>in</strong> a conductor with resistance /?.

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