CHAPTER 3 AMK10603

According to the picture from left to right, which of the answers is correct?

• neurally buoyant, positively buoyant, negatively buoyant

• negatively buoyant, neutrally buoyant, positively buoyant

• positively buoyant, neutrally buoyant, negatively buoyant

• neutrally buoyant, negatively buoyant, positively buoyant

An object floats when density of the object is...

• less than the density of the fluid it is submerged in

• more than the density of the fluid it is submerged in

• Gravitational Force

Answer explanation

Buoyant force needs to equal the weight of the object (gravity) for it to float. If it is too dense (too heavy) it will overcome the buoyant force and sink to the bottom.

Archimedes Principle means...

• force exerted on an object

• total forces that cancel each other out

• the weight of the object equals the amount of fluid displaced

• the attraction between the earth and an object

Answer explanation

Archimedes wondered why he would sink if he stepped into a bathtub, but he would float if he stepped into a boat on the water. He came to the conclusion that the buoyant force acting on an object equals the weight of gravitational force of the fluid displaced by the object. 

Constructed devices control their buoyancy by adjusting (select all that apply)

• Volume of the chamber

• Density surrounding the fluid

• Shape of the device

• Weight of the device

For an inclined plate the pressure intensity at every point differs.

• True

• False

For a floating body, if the metacentre is above the centre of gravity, the equilibrium is called

• Stable

• Unstable

• Nuetral

• None of the above

Intensity of pressure at any point in a fluid, at rest, is the same in all directions is

• Bernoulli's theorem

• Pascal's law

• Newton's first law

• Archimedes principle

When a small angular displacement is given to a body, floating in a liquid, is starts oscillating about some point. This point is called

• Geocentre

• Metacentre

• Centre of floating body

• Centre if gravity

A floating body is said to be in unstable equilibrium when the metacentre of the body is

• Coinciding with the centre of gravity of floating body

• Higher than the centre of gravity of floating body

• Lower than the centre of gravity of floating body

• None of the above

Point through which the resultant of the liquid pressure acting on a surface is known as

• Centre of pressure

• Total pressure

• Liquid pressure

• Absolute pressure