Question 1205985
.
A 133-lb student races upstairs with a vertical height of 5.3 m in 6.5 s 
to get to a class on the second floor. How much power in watts does the student expend 
in doing work against gravity? The Answer has to be in Watts.
~~~~~~~~~~~~~~~~~


<pre>
(1)  Convert the mass of 133 lbs to kilograms

        133 lbs  is  0.453592*133 = 60.328 kilograms.


(2)  Calculate the work done

        work = m*g*h = 60.328 kg * 9.81 kg/s^2 * 5.3 m = 3136.634 joules


(3)  Divide the work by the time to determine the power

        power = {{{3136.634/6.5}}} = 482.56 watts.    <U>ANSWER</U>
</pre>

Solved.