In a motor the of output work to input work, expressed a percentage, is the efficiency of the motor. !

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

Why is rain likely when warm, moisture-laden air meets cold air? a) the lighter warm air will rise and cool down, causing condensation and rain. b) the cold air moves faster and pushes the warm air away, causing condensation and rain. c) the moisture in the warm air condenses on contact with the cold air, causing rain to fall. d) the cold air mixes with the warm air, reducing its temperature causing moisture to condense.

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car