Two reversible heat engines operate in series between a source at 527oC and a sink at 17oC. If the engines have equal efficiencies and the first rejects 400 kJ to the second, calculate. V P A B C D 500 K 200 K Net work done = 60.0 J Heat bath at TH Heat bath at TL Heat Pump w qL qH Page 15 of 17 (a) The temperature at which heat is supplied to the second engine; (b) The heat taken from the source; (c) The work done by each engine

b would be the answer

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.