SELECT * FROM question_mgmt as q WHERE id=3408 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=8 AND chapterId=109 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)
A 50 kg girl wearing high heel shoes balances on a single heel. The heel is circular with a diameter 1.0 cm. What is the pressure exerted by the heel on the horizontal floor?
Mass of the girl, m = 50 kg
Diameter of the heel, d = 1 cm = 0.01 m
Radius of the heel, r = d / 2 = 0.005 m
Area of the heel = πr2
= π (0.005)2
= 7.85 × 10-5 m2
Force exerted by the heel on the floor:
F = mg
= 50 × 9.8 = 490 N
Pressure exerted by the heel on the floor:
P = Force / Area
= 490 / 7.85 x 10-5
= 6.24 × 106 N m-2
Therefore, the pressure exerted by the heel on the horizontal floor is 6.24 × 106 Nm-2.
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