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Question

A girl weighing 50 kg is standing on a pencil heels. Each having an area of cross-section 1cm2. An elephant weighing 200 kg and foot area of cross-section of 250 cm2 standing on the floor. Which of the two exerts more pressure on the floor? (Given acceleration due to gravity = 10 m/s2)


Solution

Weight of the girl = 50 kg (Given)
Area of the cross-section = 1 cm2 (Given)

P=ForceArea

Force = Weight of the body = 50 kg

 Pressure, P=50 kg1 cm-2

 1 cm = 1100

  P = 50110000

P = 500000 Nm–2

Weight of the elephant, W = 200 kg
Area of the cross-section of foot A = 250 cm2
A = 0.0250 m2

Pressure exerted by the elephant on land:

P=ForceArea=2000.0250=2000000250P=8000 Nm-2

Science
Everyday Science
Standard VIII

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