Question

A furnace is rated 4000 BTU per hour. How many foot pounds of energy are released in one hour?

Answer 1

To solve this we are going to use a conversion factor. We know that 1 BTU per hour is approximately 778 foot-pounds of energy per hour, so our conversion factor will be: $\frac{778foot-pound}{1BTU}$.

Now we just need to multiply 4000 BTU by our conversion factor:
$4000BTU*\frac{778foot-pound}{1BTU}=3112000foot-pound$

We can conclude that the furnace released 3,112,000 foot pounds of energy in one hour.