Physics Past Questions and Answers

The coefficient of friction between two perfectly smooth surface is

What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?

Calculate the work done when a force of 20N stretches a spring by 50mm.

At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg^-3, one atmosphere = 0.01 x 10⁵Nm^-2, g = 10ms^-2

What volume of alcohol will have same mass as 4.2m^-3 of petrol?
Density of alcohol = 8.4 x 10²kgm^-3, density of petrol =7.2x10³kgm^-3