Burning fossil fuel to generate electricity is the largest source of carbon dioxide emissions in the united states. carbon dioxide (co2) and other gases can have a negative impact on the quality of the air, increase global temperature, lead to the loss of ecosystems, and potentially cause harm to human health. incandescent bulbs emit 4500 pounds of co2 per year. cfl bulbs, on the other hand, emit 1051 pounds per year. led bulbs emit just 451 pounds per year. how many years would it take for cfl bulbs to emit as much co2 as one year of incandescent bulbs? round your answer to the nearest whole number.

Steam is generated in a boiler of a cogeneration plant at 10 mpa and 450°c at a steady rate of 5 kg/s. in normal operation, steam expands in a turbine to a pressure of 0.5 mpa and is then routed to the process heater, where it supplies the process heat. steam leaves the process heater as a saturated liquid and is pumped to the boiler pressure. in this mode, no steam passes through a condenser, which operates at 20 kpa. (a) determine the power produced in the turbine and the rate at which process heat is supplied in this mode. (b) determine the power produced in the turbine and the rate of process heat supplied if only 60 percent of the steam is routed to the process heater and the remainder is expanded to the condenser pressure. (3.32 mw; 9.69 mw; 4.25 mw; 5.82 mw)

The volume of a gas is halved during an adiabatic compression that increases the pressure by a factor of 2.5. what is the specific heat ratio? show the math steps .

Sawyer is studying diffraction. he draws a diagram of a plane wave to show how light waves travel. which best describes sawyer’s error? the wave fronts should be perpendicular to the direction in which the waves move. the arrow showing the direction of movement of the waves should be pointing to the left. the arrow showing the direction of movement of the waves should be pointing downward. the wave fronts should be both parallel and perpendicular to the direction in which the waves move.