Advertisements
Advertisements
Question
A boy weighing 60 kgf stands on platform of dimensions 2.5 cm x 0.5 cm. What pressure in pascal does he exert?
Advertisements
Solution
Force = Thrust = Weight = 60 kgf
= 60 x 10 = 600 N
Area of platform = 2.5 cm x 0.5 cm
`=2.5/100m xx0.5/100 m = 25/1000xx5/1000`
=`1/40xx1/200=1/8000m^2`
Pressure P = `F/ A = ( 600N)/((1m^2)/8000)`
`= (600 xx 8000)/1` =
= 4800000
=`4800000/10xx10`
= 4.8 × 106 Pa
APPEARS IN
RELATED QUESTIONS
The S.I. unit of pressure is pascal.
The pressure and thrust are related as
Find the thrust required to exert a pressure of 50000 pascals on an area of 0.05 m2 ?
It is difficult to cut cloth using a pair of scissors with blunt blades. Explain.
Pressure can be increased by decreasing the force.
Upthrust = weight of the fluid displaced – apparent weight of the object.
What happens when pressure is increased in solids?
Assertion (A): Wide wooden sleepers are kept below railway lines to reduce pressure on the railway tracks and prevent them from sinking into the ground.
Reason (R): Pressure is directly proportional to the area in which it is acting.
Pressure is a scalar quantity because ______.
- it is the ratio of force to area and both force and area are vectors.
- it is the ratio of the magnitude of the force to area.
- it is the ratio of the component of the force normal to the area.
- it does not depend on the size of the area chosen.
Iceberg floats in water with part of it submerged. What is the fraction of the volume of iceberg submerged if the density of ice is ρi = 0.917 g cm–3?
