Physics Past Questions and Answers

What force has to be exerted on a mass 60kg to give it an acceleration of 10ms^-2 vertically upwards?
[g = 10ms^-2

A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?

A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.
Calculate the time taken to reach the maximum height?
[g = 10ms-2]

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

Which of the following electromagnetic waves has the shortest wavelength?