Please help me answer this A 0.25 kg arrow going 45 m/s is shot into a 5.0 kg target . The target is on wheels , find how fast it will roll backwards. ​

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.

Where do magnetic lines of force enter earth?

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.