Chapter 11 Deformation of Solids

• X- Glass, Y- Copper, Z- Rubber

• X- Glass, Y- Rubber, Z- Copper

• X- Rubber, Y- Copper, Z- Glass

• X- Rubber, Y- Glass, Z- Copper

If the Young's modulus of steel is twice that of copper, which statement is true?

• The extension of the copper wire is twice of the steel wire.

• The stress of the steel wire is twice of the copper wire.

• The strain of the steel wire is twice of the copper wire.

• The final length of the copper wire is twice of the steel wire.

The total maximum mass of a lift and its load is 2500 kg. The maximum upwards acceleration of the lift is 22.0 m s^-2. What is the minimum tensile strength of the lift cable with cross-sectional area, 10×10^-4 m² ?

• 2.5 x 10⁷ N m^-2

• 3.0 x 10⁷ N m^-2

• 5.5 x 10⁷ N m^-2

• 8.0 x 10⁷ N m^-2

A steel wire of length 2 m and cross-sectional area 0.80 x 10^-6 m² has a Young modulus of 2.0 x 10¹¹ Pa. The upper end of the wire is fixed and a load of 4 N is tied at the other end. The extension in mm of the wire is

• 0.002

• 0.050

• 0.50

• 1.00

• 5.00

What is the correct unit for strain?

• Pa

• Nm^-2

• No unit

• Nm²

Select all the correct units for stress.

• Pa

• Nm^-2

• Nm²

• No unit

Select all the correct units for Young's Modulus

• Pa

• Nm^-2

• Jm^-3

• No unit

The Young's Modulus is defined as...

• The gradient of a stress strain graph

• The energy required to stretch a material.

• Stress/Strain

• Force/Extension.

When a spring fixed at one end is pulled by a force of 8 N, the extension is 40 mm. Two such springs are joined in series and is pulled to produce a total extension of 40 mm. What is the strain energy in the springs?

• 0.04 J

• 0.08 J

• 0.16 J

• 0.32 J

If the material recovers the original dimensions, when an external load is removed, this deformation is known as ______ deformation

• plastic

• permanent

• elastic

• reversible