# NCERT Class 11 Physics Solutions: Chapter 9 – Mechanical Properties of Solid-Part 6

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**Question 9.15:**

Determine the volume contraction of a solid copper cube on an edge, when subjected to a hydraulic pressure of

**Answer:**

Length of an edge of the solid copper cube,

Hydraulic pressure,

Bulk modulus of copper,

Bulk Modulus,

Where,

Volumetric strain

Change in volume

Original volume

Original volume of the cube,

Therefore, the volume contraction of the solid copper cube is

**Question 9.16:**

How much should the pressure on a liter of water be changed to compress it by

**Answer:**

Volume of water,

It is given that water is to be compressed by

Bulk modulus ,

Bulk modulus of water,

Therefore, the pressure on water should be

**Question 9.17:**

Anvils made of single crystals of diamond, with the shape as shown in Figure, are used to investigate behaviour of materials under very high pressures. Flat faces at the narrow end of the anvil have a diameter of , and the wide ends are subjected to a compressional force of What is the pressure at the tip of the anvil?

**Answer:**

Diameter of the cones at the narrow ends,

Compressional force,

Pressure at the tip of the anvil:

Therefore, the pressure at the tip of the anvil is