Question

A plastic bottle is filled with a liquid. total mass of the bottle with a liquid is 6000g.and it has a volume of 550cm cube.Will the bottle sink or float? give reasons for your answer.​

Answer 1

The gravitational pull on the empty plastic bottle is less than the upthrust force exerted on it by the water. In other words, its density is less than the density of water therefore it floats. On the other hand, a plastic bottle filled with sand sinks as the gravitational pull (weight) on it is more than the upthrust force of water.