A solid metal sphere of volume 0 . 31 m 3 is dropped in an ocean where water pressure is 2 × 10 7 N m 2 • Calculate change in volume of the sphere if bulk modulus of the metal is 6 . 1 × 10 10 N m 2 .

Given - V = 0 . 31 m 3 , K = 6 . 1 × 10 10 N m 2 , P = 2 × 10 7 N m 2 Therefore K = - P Δ V V ⇒ Δ V = - P V K = 2 × 10 7 × 0 . 31 6 . 1 × 10 10 = 0 . 101 × 10 - 3 ≈ 10 - 4 m 3

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What is friction? Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.

Important Questions on Mechanical Properties of Solids

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 4

State Hooke’s law. Draw a labeled graph of tensile stress against tensile strain for a metal wire up to the breaking point. In this graph show the region in which Hooke’s law is obeyed.

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

Calculate the coefficient of static friction for an object of

m a s s 50 k g

placed on horizontal table pulled by attaching a spring balance. The force is increased gradually it is observed that the object just moves when spring balance shows

50 N

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

A block of

m a s s 37 k g

rests on a rough horizontal plane having coefficient of static friction

0.3

Find out the least force required to just move the block horizontally.

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

A body of mass

37 k g

rests on a rough horizontal surface. The minimum horizontal force required to just start the motion is

68.5 N

. In order to keep the body moving with constant velocity, a force of

43 N

is needed. What is the value of (a) coefficient of static friction? And (b) coefficient of kinetic friction?

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

A wire gets stretched by

4 m m

due to a certain load. If the same load is applied to a wire of same material with half the length and double the diameter of the first wire? What will be the change in its length?

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

Calculate the work done in stretching a steel wire of length

2 m

and cross sectional area

0.0225 m m^{2}

when a load of

100 N

is slowly applied to its free end.

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11th Maharashtra Board

IMPORTANT

Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

A solid metal sphere of volume

0.31 m^{3}

is dropped in an ocean where water pressure is

2 \times 10^{7} \frac{N}{m^{2}}

• Calculate change in volume of the sphere if bulk modulus of the metal is

6.1 \times 10^{10} \frac{N}{m^{2}}

EASY

11th Maharashtra Board

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Physics>Chapter 6 - Mechanical Properties of Solids>Exercises>Q 5

A wire of mild steel as initial length

1.5 m

and diameter

0.60 m m

gets extended by

6.3 m m

when a certain force is applied to it. If Young's modulus of mild steel is

2.1 \times 10^{11} \frac{N}{m^{2}}

calculate force applied.

What is friction? Define coefficient of static friction and coefficient of kinetic friction. Give the necessary formula for each.

Important Questions on Mechanical Properties of Solids

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