Advertisements
Advertisements
प्रश्न
Explain the following statement:
It is easier to cut with a sharp knife than with a blunt one.
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
Which of the following will sink or float on water? (Density of water = 1 g Cm-3) body B having density 2520 kg m-3
Which of the following will sink or float on water? (Density of water = 1 g Cm-3)
body D having density 0.85 g m-3
Explain the following statement:
Sleepers are laid below the rails.
Explain why a gas bubble released at the bottom of a lake grows in size as it rises to the surface of the lake.
Complete the following sentence :
Pressure at a point inside the liquid is ...................... To its depth.
A block of iron of mass 7.5 kg and of dimensions 12 cm × 8 cm × 10 cm is kept on a table top on its base of side 12 cm × 8 cm.
Calculate:
- Thrust and
- Pressure exerted on the table top
Take 1 kgf = 10 N.
A homogeneous block floats on water (a) partly immersed (b) completely immersed. In each case state the position of centre of buoyancy B with respect to the centre of gravity G of the block.
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.
Calculate the hydrostatic pressure exerted by water at the bottom of a beaker. Take the depth of water as 40 cm, the density of water 1000 kgm−3 and g = 9.8 ms−2.
Define atmospheric pressure diving suits. Does a diving suit create buoyancy?