Which method of separation of mixtures is vital to life on earth? filtration, sifting, evaporation, or distillation?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Ahot-air balloon is 11.0 m above the ground and rising at a speed of 7.00 m/s. a ball is thrown horizontally from the balloon basket at a speed of 9.00 m/s. ignore friction and air resistance and find the speed of the ball when it strikes the ground.

Answer fast for brainliest! < 3 what type of image is formed by a reflecting telescope? a reduced virtual image a reduced real image an enlarged real image an enlarged virtual image