A satellite of mass 3000 kg orbits the Earth in a circular orbit of radius of 6.6 × 10^6 m (this is above the Earth's atmosphere).The mass of the Earth is 6 × 10^24 kg.

a. What is the speed of the satellite?
b. What is the minimum amount of energy required to move the satellite from this orbit to a location very far away from the Earth?

Air is contained in a variable-load piston-cylinder device equipped with a paddle wheel. initially, air is at 400 kpa and 17°c. the paddle wheel is now turned by an external electric motor until 75 kj/kg of work has been transferred to air. during this process, heat is transferred to maintain a constant air temperature while allowing the gas volume to triple. calculate the required amount of heat transfer in kj/kg.