# Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board chapter 5 - Oscillations [Latest edition]

#### Chapters ## Solutions for Chapter 5: Oscillations

Below listed, you can find solutions for Chapter 5 of Maharashtra State Board Balbharati for Physics 12th Standard HSC Maharashtra State Board.

Exercises
Exercises [Pages 129 - 130]

### Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board Chapter 5 Oscillations Exercises [Pages 129 - 130]

Exercises | Q 1.1 | Page 129

Choose the correct option:

A particle performs linear S.H.M. starting from the mean position. Its amplitude is A and time period is T. At the instance when its speed is half the maximum speed, its displacement x is ______.

• sqrt3/2 A

• 2/sqrt3 A

• A/2

• 1/sqrt2A

Exercises | Q 1.2 | Page 129

Choose the correct option:

A body of mass 1 kg is performing linear S.H.M. Its displacement x (cm) at t(second) is given by x = 6 sin (100t + π/4). Maximum kinetic energy of the body is ______.

• 36J

• 9J

• 27J

• 18J

Exercises | Q 1.3 | Page 129

Choose the correct option:

The length of second's pendulum on the surface of earth is nearly 1 m. Its length on the surface of moon should be [Given: acceleration due to gravity (g) on moon is 1/6 th of that on the earth’s surface]

• 1/6m

• 6 m

• 1/36 m

• 1/sqrt6m

Exercises | Q 1.4 | Page 129

Choose the correct option:

Two identical springs of constant k are connected, first in series and then in parallel. A metal block of mass m is suspended from their combination. The ratio of their frequencies of vertical oscillations will be in a ratio

• 1:4

• 1:2

• 2:1

• 4:1

Exercises | Q 1.5 | Page 129

Choose the correct option:

The graph shows variation of displacement of a particle performing S.H.M. with time t. Which of the following statements is correct from the graph? • The acceleration is maximum at time T.

• The force is maximum at time (3T)/4.

• The velocity is zero at time T/2.

• The kinetic energy is equal to total energy at a time T/4.

Exercises | Q 2.1 | Page 129

Define linear simple harmonic motion.

Exercises | Q 2.2 | Page 129

Using differential equations of linear S.H.M, obtain the expression for (a) velocity in S.H.M., (b) acceleration in S.H.M.

Exercises | Q 2.3 | Page 129

Obtain the expression for the period of a simple pendulum performing S.H.M.

Exercises | Q 2.4 | Page 129

State the law of simple pendulum.

Exercises | Q 2.5 | Page 129

Prove that under certain conditions a magnet vibrating in a uniform magnetic field performs angular S.H.M.

Exercises | Q 3 | Page 129

Obtain the expression for the period of a magnet vibrating in a uniform magnetic field and performing S.H.M.

Exercises | Q 4 | Page 129

Show that S.H.M. is a projection of  U.C.M. on any diameter

Exercises | Q 5 | Page 129

Draw graphs of displacement, velocity, and acceleration against phase angle, for a particle performing linear S.H.M. from (a) the mean position (b) the positive extreme position. Deduce your conclusions from the graph.

Exercises | Q 6 | Page 129

Deduce the expressions for the kinetic energy and potential energy of a particle executing S.H.M. Hence obtain the expression for the total energy of a particle performing S.H.M and show that the total energy is conserved. State the factors on which total energy depends.

Exercises | Q 7 | Page 129

Derive an expression for the period of motion of a simple pendulum. On which factors does it depend?

Exercises | Q 8 | Page 129

At what distance from the mean position is the speed of a particle performing S.H.M. half its maximum speed. Given the path length of S.H.M. = 10 cm.

Exercises | Q 9 | Page 130

In SI units, the differential equation of an S.H.M. is ("d"^2"x")/("dt"^2) = − 36x. Find its frequency and period.

Exercises | Q 10 | Page 130

A needle of a sewing machine moves along a path of amplitude 4 cm with a frequency of 5 Hz. Find its acceleration (1/30) s after it has crossed the mean position.

Exercises | Q 11 | Page 130

Potential energy of a particle performing linear S.H.M. is 0.1π2x2 joule. If the mass of the particle is 20 g, find the frequency of S.H.M.

Exercises | Q 12 | Page 130

The total energy of a body of mass 2 kg performing S.H.M. is 40 J. Find its speed while crossing the center of the path.

Exercises | Q 13 | Page 130

A simple pendulum performs S.H.M. of period 4 seconds. How much time after crossing the mean position, will the displacement of the bob be one-third of its amplitude.

Exercises | Q 14 | Page 130

A simple pendulum of length 100 cm performs S.H.M. Find the restoring force acting on its bob of mass 50 g when the displacement from the mean position is 3 cm.

Exercises | Q 15 | Page 130

Find the change in length of a second’s pendulum, if the acceleration due to gravity at the place changes from 9.75 m/s2 to 9.8 m/s2.

Exercises | Q 16 | Page 130

At what distance from the mean position is the kinetic energy of a particle performing S.H.M. of amplitude 8 cm, three times its potential energy?

Exercises | Q 17 | Page 130

A particle performing linear S.H.M. of period 2π seconds about the mean position O is observed to have a speed of "b" sqrt3 m/s, when at a distance b (metre) from O. If the particle is moving away from O at that instant, find the time required by the particle, to travel a further distance b.

Exercises | Q 18 | Page 130

The period of oscillation of a body of mass m1 suspended from a light spring is T. When a body of mass m2 is tied to the first body and the system is made to oscillate, the period is 2T. Compare the masses m1 and m2

Exercises | Q 19 | Page 130

The displacement of an oscillating particle is given by x = a sin ω t + b cos ω t where a, b and ω are constants. Prove that the particle performs a linear S.H.M. with amplitude A = sqrt("a"^2 + "b"^2)

Exercises | Q 20 | Page 130

Two parallel S.H.M.s represented by "x"_1 = 5 sin(4π"t" + π/3) cm and "x"_2 = 3sin (4π"t" + π/4) cm are superposed on a particle. Determine the amplitude and epoch of the resultant S.H.M.

Exercises | Q 21 | Page 130

A 20 cm wide thin circular disc of mass 200 g is suspended to rigid support from a thin metallic string. By holding the rim of the disc, the string is twisted through 60° and released. It now performs angular oscillations of period 1 second. Calculate the maximum restoring torque generated in the string under undamped conditions. (π3 ≈ 31)

Exercises | Q 22 | Page 130

Find the number of oscillations performed per minute by a magnet is vibrating in the plane of a uniform field of 1.6 × 10-5 Wb/m2. The magnet has a moment of inertia 3 × 10-6 kg/m2 and magnetic moment 3 A m2.

Exercises | Q 23 | Page 130

A wooden block of mass m is kept on a piston that can perform vertical vibrations of adjustable frequency and amplitude. During vibrations, we don’t want the block to leave the contact with the piston. How much maximum frequency is possible if the amplitude of vibrations is restricted to 25 cm? In this case, how much is the energy per unit mass of the block? (g ≈ π2 ≈ 10 m/s-2)

## Solutions for Chapter 5: Oscillations

Exercises ## Balbharati solutions for Physics 12th Standard HSC Maharashtra State Board chapter 5 - Oscillations

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Concepts covered in Physics 12th Standard HSC Maharashtra State Board chapter 5 Oscillations are Oscillations, Explanation of Periodic Motion, Linear Simple Harmonic Motion (S.H.M.), Differential Equation of Linear S.H.M., Acceleration (a), Velocity (v) and Displacement (x) of S.H.M., Amplitude (A), Period (T) and Frequency (N) of S.H.M., Reference Circle Method, Phase in S.H.M., Graphical Representation of S.H.M., Composition of Two S.H.M.’S Having Same Period and Along Same Line, The Energy of a Particle Performing S.H.M., Simple Pendulum, Angular S.H.M. and It's Differential Equation, Damped Oscillations, Free Oscillations, Forced Oscillations and Resonance Oscillations, Periodic and Oscillatory Motion.

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