Question 30
The maximum pressure
that granite rock can withstand is 2.0 × 108 N m-2. Above this pressure, the rock
begins to flow like a liquid. The density of granite is 2.7 × 103 kg m-3.
What would be the
height of a pure granite mountain whose base is just beginning to flow?
A 3.8 × 103 m B 7.6 × 103 m C 3.7 × 104 m D 7.4 × 104 m
Reference: Past Exam Paper – June 2015 Paper 12 Q20
Solution:
Answer: B.
Maximum pressure that the rock can withstand = 2.0×108
N m-2.
This pressure is caused by a height h of granite.
Pressure P = hρg
Height h = P / ρg
Height h = (2.0×108) / (2.7×103 × 9.81)
Height h = 7.6×103 m
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