Advertisements
Advertisements
प्रश्न
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
Advertisements
उत्तर
A body shall weigh more in vacuum because in vacuum, i.e. in absence of air, no upthrust will act on the body.
APPEARS IN
संबंधित प्रश्न
Relative density of a substance is expressed in g cm-3.
The density of aluminium is 2.7 g cm-3 and that of brass 8.4 g cm’3. The correct statement is
Define buoyant force. Name two factors on which buoyant force depends.
A boy get into a floating boat.
What happens to the buoyant force on the boat ?
How is the unit bar related to the S.I. unit pascal?
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
Why do sea divers need special protective suit?
Prove that the loss in weight of a body when immersed wholly or partially in a liquid is equal to the buoyant force (or upthrust) and this loss is because of the difference in pressure exerted by liquid on the upper and lower surfaces of the submerged part of body.
You are provided with a hollow iron ball A of volume 15 cm3 and mass 12 g and a solid iron ball B of mass 12 g. Both are placed on the surface of water contained in a large tub.
- Find upthrust on each ball.
- Which ball will sink? Give a reason for your answer (Density of iron = 8.0 g cm-3)
A body is held inside water contained in a vessel by tying it with a thread to the base of the vessel. Name the three forces that keep the body in equilibrium, and state the direction in which each force acts.
