A train is traveling at a velocity of 90 m/s and it has to travel a distance of 2500 meters to reach the train station. How long until the train reaches the train station?

What is the frequency of a light wave with a wavelength of 620nm

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 charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface