A parachutist falls from rest from a balloon. The variation with time of the vertical velocity of the parachutist is shown. [Figure showing vertical velocity against time with regions A, B, C, D] In which region is the force due to air resistance much greater than the weight of the parachutist?

A rock of mass 2m, travelling in deep space at velocity v, explodes into two parts of equal mass, one of which is the…

An object of fixed mass is initially at rest at point P. The object then moves away from point P with uniform acceler…

What is the definition of force?

Diffraction is a term used to describe one aspect of wave behaviour. What does diffraction make possible?

Monochromatic light of wavelength 5.30 × 10⁻⁷ m is incident normally on a diffraction grating. The first order maximu…

The electric field strength at a certain distance from an isolated alpha particle is 3.0 × 10⁷ N C⁻¹. What is the for…