Advertisements
Advertisements
Question
Define the term ‘pressure’ and state its unit.
Advertisements
Solution
PRESSURE : “The thrust on unit area of the surface is called PRESSURE.”
Pressure = Thrust / Area
S.I. unit = Nm-2
APPEARS IN
RELATED QUESTIONS
A plane is in level flight at a constant speed and each of its two wings has an area of 25 m2. If the speed of the air is 180 km/h over the lower wing and 234 km/h over the upper wing surface, determine the plane’s mass. (Take air density to be 1 kg m–3).
Why do camels or elephants have broad feet?
Calculate the pressure exerted on a surface of 0.5 m2 by a thrust of 100 kgf.
Water flows through a horizontal tube of variable cross section. The area of cross section at A and B are 4 mm2 and 2 mm2 respectively. If 1 cc of water enters per second through A, find (a) the speed of water at A, (b) the speed of water at B and (c) the pressure difference PA − PB.

Find the pressure 200m below the surface of the ocean if pressure on the free surface of liquid is one atmosphere. (Density of seawater = 1060 kg/m3)
A chapatti maker is a machine which converts balls of dough into chapatties. What effect of force comes into play in this process?
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Give reasons why:
a single nail pricking the body is painful when compared to lying on a bed of nails.
Hot air is ______ dense than ordinary air.
What happens when pressure is increased in solids?
