Energy is the ability to do work. All of the following describe work being done EXCEPT: Select one:

a.
blowing out a candle's flame

b.
holding a heavy bowling ball

c.
lifting a mug of hot chocolate

d.
wiping dust off a coffee table

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)