First slide

Elastic Modulie

Question

What increase in pressure is required to decrease the volume of 200 litre of water by 0.004 percent? Given bulk modulus of water is 2100 MPa.

Moderate

A

21 kPa
B

84 kPa
C

42 kPa
D

none of these

Solution

$∆ V = 0.00004 (200 L) = 0.008 L$
$∆ p = B (- \frac{∆ V}{V})$
= $(2100 MPa) (\frac{0.008 L}{200 L})$
= 0.084 MPa = 84 kPa

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