When a system of filters gradually turns a beam of orange light into a beam of green light, what is occurring?

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

Why is it important always to use horizontal bars in unit fractions when performing unit conversions?

Which accounts for an increase in the temperature of a gas that is kept a constant volume