You have decided to build a dishwasher, powered by human effort alone. it will have a drum capacity of 20 litres of water. you will use mains water and heat it electrically to 60°c. mains water has a density of 1.00g cm3 and an out-of-the-tap temperature of 11°c. it has a specific heat capacity of 4.2 ] g1 °k1 a. how much energy does it take to heat 20l of water from its initial temperature to a 60°c maximum? assume no heat losses occur. you investigate using a treadmill as a source of energy. volunteers use the treadmill and produce a range of values, shown in the table below. b. what is the average power output of the volunteers on the treadmill generator? volunteer power output/w a 157 333 301 133 209 assume that the power calculated in part (b) is collected with 100% efficiency and fed in to an electrical heating element in a 20l container of water c. how long will it take to warm the out-of-the-tap cold water to 60°c in your dishwasher with this human power? next you decide to use an exercise bike to create electrical heating power. with the same volunteers you produce another range of output powers. volunteer power output w a 581 d. what is the shortest time that the exercise bike heater will take to warm the water if you have volunteers a to e to choose from? b 455 285 266 386