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Question
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
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Solution
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.
RELATED QUESTIONS
State whether the following statement is true or false :
The buoyant force depends on the nature of object immersed in the liquid
Explain the meaning of the statement
‘Relative density of aluminium is 2.7’.
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
(a) body A having density of 500 kg m-3
What is meant by the term buoyancy?
Complete the following sentence :
Two balls, one of iron and the other of aluminium experience the same upthrust when dipped completely in water if _____________ .
A body weighs 450 gf in air and 310 gf when completely immersed in water. Find
(i) The volume of the body,
(ii) The loss in weight of the body, and
(iii) The upthrust on the body.
State the assumption made in part (i).
A block of wood is floating on water with its dimensions 50 cm x 50 cm x 50 cm inside water. Calculate the buoyant force acting on the block. Take g = 9.8 N kg-1.
Two identical pieces, one of ice (density = 900kg per meter cube) and other wood (density = 300kg per meter cube) float on water.
- Which of the two will have more volume submerged inside water
- Which of two will experience more upthrust due to water.
The magnitude of buoyant force acting on an object immersed in a liquid depends on ______ of the liquid.
State whether true or false. If false, correct the statement.
The weight of fluid displaced determines the buoyant force on an object.
