How to find average speed in physics

What color of light must blue light mix with to create white light? a. yellow b. white c. blue d. green

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

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.