Compared to that of a plane on the ground, earth’s gravitational pull on a plane 7 miles above earth is approximately a) zero b) the same c) half as much d) twice as much

Hey.. ♥️♥️ me in solving this question

Agas expands from an initial volume of 0.040 m^3 and an initial pressure of 210 kpa to a final volume of 0.065 m^3 while its temperature is kept constant. how much work is done by the system?

It is really hard for me right know