Advertisements
Advertisements
प्रश्न
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Why does a piece of ice float on water?
Explain why an iron needle sinks in water, but a ship made of iron floats on water.
Why is the tip of an allpin made sharp?
State three factors on which the pressure at a point in a liquid depends.
Complete the following sentence :
Pressure at a depth h in a liquid of density p is ......................
The pressure P1 at the top of a dam and P2 at a depth h form the top inside water (density p) are related as :
The area of base of a cylindrical vessel is 300 cm2. Water (density= 1000 kg m-3) is poured into it up to a depth of 6 cm. Calculate : (a) the pressure and (b) the thrust of water on the base. (g = 10m s-2.
It is easier to lift a heavy stone under water than in air. Explain.
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.
Consider the statement given below and choose the correct option.
Assertion: Water strider slides easily on the surface of the water.
Reason: Water strider experiences less buoyant force.
