The area of tibet is 1,230,000 km^2 . the average annual insolation (hours of equivalent full sunlight on a horizontal surface) is 3000 h. if one-half the area of tibet is covered with solar panels of 10% efficiency, how much electricity per year can be generated? what percentage of the world’s energy needs can be satisfied? (the total energy consumption of the world in 2007 was 500 ej.)

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

Air enters a gas turbine with two stages of compression and two stages of expansion at 100 kpa and 17°c. this system uses a regenerator as well as reheating and intercooling – the intercooler returns the air to the inlet temperature. the pressure ratio across each compressor is 4 ; 300 kj/kg of heat are added to the air in each combustion chamber; and the regenerator operates perfectly while increasing the temperature of the cold air by 20°c. determine the system’s thermal efficiency. assume isentropic operations for all compressor and the turbine stages and use constant specific heats at room temperature. (0.378)

Which of these activities increases the amount of carbon in the atmosphere?