ICSE Class 6 Answered
A girl of mass 50kg is standing on pencil heels.Area of cross section of each heel is 1sq cm and an elephant of mass 5000kg and foot area 250sq cm is standing on the floor.Which one will exert more pressure and what is the difference between the pressure exerted by the girl and the elephant.
Asked by Dibyendu | 15 Aug, 2017, 08:11: PM
Expert Answer
We know that pressure exerted is given by the formula Pressure = Force / Area
And Force = Weight = mg
Step 1: For the girl:
Area of the cross section is for two feets. So A = 2 × 1 cm2
Calculate weight and substitute in the formula of pressure.
It comes out to be Pg = 250 N cm2
Step 2: For elephant:
Area of the cross section is for four feet. So A = 4 × 250 cm2
Calculate weight and substitute in the formula of pressure.
It comes out to be Pe = 50 N cm2
Thus, the pressure exerted by the girl is more than that of the elephant.
It is five times more!!..
Answered by Yashvanti Jain | 16 Aug, 2017, 11:11: AM
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