Physics Past Questions and Answers

The hatch door of a submarine has an area of 0.5 m². The specific gravity of seawater is 1.03. Assume that g = 10m/s²and neglect the atmospheric pressure. The force exerted by the sea water on the hatch door at a depth of 200m is ____________

When equal weights of iron and water are subjected loan equal supply of heat, it is found that the piece of iron becomes much hotter than water after a short time because ____________

The speed of light in is 3.0x108 m/s. Its speed in glass having a refractive index of 1.65 is ____________

The slope of a straight-line displacement time graph indicates ____________

A ball of mass 0.5kg moving at 10m/s collides with another ball of equal mass at rest. If the two balls move off together after the impart, calculate their common velocity