Chapter 1
An oxen can deliver typically hp. With Table 3 on the conversion of nonSI units, we see that this equals about 740 x = 600 W. The amount of energy delivered in one year by this oxen can be calculated if we know how many hours the oxen works in a year. Assume this is 4 hours a day during 300 days, 1,200 hours per year. One hour is ...