Why is nitrogen or helium filled in a filament lamp? ?

Using a wheel and axle, a farmer is trying to lift a bucket of water from the bottom of a well. the larger wheel has a radius of 40 cm compared to the axle that has a radius of 10 cm. if a bucket of water is 50 n, then how much effort is required to raise it? 12.5 n 200 n 2 n 500 n

The slope of a velocity time graph over any interval of time gives the during that interval

Which lists the organs in the correct order as food passes from the mouth to anus?