A person lifts a 4.1 kg cement block a vertical distance of 0.79 m and then carries the block horizontally a distance of 13.30 m. (a) How much work is done by the person in the process? (b) How much work is done by gravity in the process?
February 29, 2012
No one can predict a natural disaster or world crisis. When a hurricane or flood or a pandemic strikes a country, who is most likely to respond first? Which economic system is the best solution to handling a crisis of epic proportion?
September 4, 2011