Question

A cable that weighs 8 lb/ft is used to lift 550 lb of coal up a...

A cable that weighs 8 lb/ft is used to lift 550 lb of coal up a mine shaft 450 ft deep. Find the work done.

Show how to approximate the required work by a Riemann sum. (Let x be the distance in feet below the top of the shaft. Enter xi* as xi.)

lim n→∞

n

   
Δx
i = 1



Express the work as an integral.


dx





Evaluate the integral.
ft-lb

Math   Calculus   
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