13.80 0.753 Compare the energy intensities calculated in question 4. Do these values correspond with the tendency for countries with high-tech economies to have lower energy intensities? Predict the change to energy intensity if farmers introduced techniques that ’s increased crop productivity. Suggest reasons why a developed country has a high energy intensity. – – Calculate the energy efficiency of a water heater that uses 200J of energy to increase the thermal energy of water 55J. If an automobile engine is 20% efficient, calculate the useful output energy from 1kg of gasoline containing 44.5MJ of chemical potential energy.
13.80 0.753 Compare the energy intensities calculated in question 4. Do these values correspond with the tendency for countries with high-tech economies to have lower energy intensities? Predict the change to ’s energy intensity if farmers introduced techniques that increased crop productivity. Suggest reasons why – a developed country – has a high energy intensity. Calculate the energy efficiency of a water heater that uses 200J of energy to increase the thermal energy of water 55J. If an automobile engine is 20% efficient, calculate the useful output energy from 1kg of gasoline containing 44.5MJ of chemical potential energy.
unit_d_notes_2016_combined.docx