A man loads 1,000 sacks of flour into a truck in 30 minutes. each sack has a mass of 20 kg and the man must lift each sack 1.00 m from a cart up onto the truck bed. How much power did the man develop?
Mass = 1000sacks * 20kg/sack = 20,000kg
d = 1000sacks * 1m/sack = 1000 m.
Power = F*d/t = Mg * d/t =
20000*9.8 * 1000/1800s = 108,889 J/s =
108,889 Watts