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प्रश्न
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
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उत्तर
It is easier to cut with a sharp knife because even a small thrust causes great pressure at the edges and cutting can be done with less effort.
संबंधित प्रश्न
A body while floating sinks deeper in a liquid of low density than in a liquid of high density.
What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid ? When does the buoyant force become maximum ?
The S.I. unit of density is ..........
Define upthrust and state its S.I. unit.
Will a body weigh more in air or vacuum when weighed with a spring balance? Give a reason for your answer.
The S.I. unit of upthrust is :
A body of mass 3.5 kg displaces 1000 cm3 of water when fully immersed inside it. Calculate:
- the volume of body,
- the upthrust on body and
- the apparent weight of body in water.
Figure shows the same block of wood floating in three different liquids A, B and C of densities ρ1, ρ2 and ρ3 respectively. Which of the liquid has the highest density? Give a reason for your answer.
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.
Assertion (A): The buoyant force on a submerged rigid object can be considered to be acting at the center of mass of the object.
Reason (R): In rigid body, force distributed uniformly through its volume can be considered to be acting at the centre of mass of the body.
