A 7.20x10^3 N spacecraft travels away from the Earth. What is its weight when it is a) 6.38×10^3 km and b) 1.28x10^4 km from the surface of the Earth?

2kg of refrigerant 134a undergoes a polytropic process in a piston-cylinder assembly from an initial state of saturated vapor at 2 bar to a final state of 12 bar, 80 degree c. a)determine the work for the process in kj. b)sketch the process on a p-v diagram.

The softest and hardest minerals are: softest hardest

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this