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QUESTION: 1

A particle moving along the X-axis, executes simple harmonic motion then the force acting on it is given by [1988]

Solution:

For simple harmonic motion, F = – kx.

Here, k = Ak.

QUESTION: 2

A particle, with restoring force proportional to displacement and resistve force proportional to velocity is subjected to a force F sin ω_{0}. If the amplitude of the particle is maximum for ω = ω_{1} and the energy of the particle is maximum for ω = ω_{2}, then [1989,1998]

Solution:

At maximum energy of the particle, velocity resonance takes place, which occurs when frequency of external periodic force is equal to natural frequency of undamped vibrations, i.e. ω_{2} = ω_{0}.

Further, amplitude resonance takes place at a frequency of external force which is less than the frequency of undamped natural vibrations, i.e. ω_{1} ≠ ω_{0} .

QUESTION: 3

A mass m is suspen ded from a two coupled springs, connected in series. The force constant for springs are k_{1 }and k_{2}. The time period of the suspended mass will be [1990]

Solution:

The effective spring constant of two springs in series;

Time period,

QUESTION: 4

The composition of two simple h ar monic motions of equal periods at right angle to each other and with a phase difference of π results in the displacement of the particle along [1990]

Solution:

x = a sinωt and y = b sin (ωt + π) = – b sinωt

It is an equatation of a straight line.

QUESTION: 5

The angular velocity and the amplitude of a simple pendulum is ω and a respectively. At a displacement x from the mean position if its kinetic energy is T and potential energy is V, then the ratio of T to V is [1991]

Solution:

PE ,

and K.E.

QUESTION: 6

A body is executing S .H. M . When the displacements from the mean position are 4cm and 5 cm, the corresponding velocities of the body are 10 cm per sec and 8 cm per sec. Then the time period of the body is [1991]

Solution:

For S.H.M., Velocity,

at displacement x.

Putting this value in equation (2) mentioned above,

radian / sec .

Time period

QUESTION: 7

A simple pendulum is suspended from the roof of a trolley which moves in a horizontal direction with an acceleration a, then the time period is given by , where g is equal to [1991]

Solution:

The effective value of acceleration due to gravity is

QUESTION: 8

If a simple harmonic oscillator has got a displacement of 0.02 m and acceleration equal to 2.0 m/s^{2} at any time, the angular frequency of the oscillator is equal to [1992]

Solution:

ω^{2}= 100 or ω = 10 rad/s

QUESTION: 9

A simple harmonic oscillator has an amplitude A and time period T. The time required by it to travel from x = A to x = A/2 is [1992]

Solution:

For S.H.M.,

When x = A,

When

or,

Now, time taken to travel from x = A to x = A/2 is (T/4 – T/12) = T/6

QUESTION: 10

A wave has S.H.M (Simple Harmonic Motion) whose period is 4 seconds while another wave which also possess SHM has its period 3 seconds. If both are combined, then the resultant wave will have the period equal to [1993]

Solution:

Beats are produced. Frequency of beats will be

Hence time period = 12 s.

[**Alt :** Frequency of combined S.H.M

QUESTION: 11

A body executes S.H.M with an amplitude A. At what displacement from the mean position is the potential energy of the body is one fourth of its total energy ? [1993]

Solution:

Total energy

[Alt : The displacement at which the P.E. becomes n times the total energy is given by

where A is the amplitude.]

QUESTION: 12

Which one of the following is a simple harmonic motion? [1994]

Solution:

A wave moving through a string fixed at both ends, is a transverse wave formed as a result of simple harmonic motion of particles of the string.

QUESTION: 13

A par ticle is subjected to two mutually perpendicular simple harmonic motions such that its x and y coordinates are given by

x = 2 sin ωt;

The path of the particle will be [1994]

Solution:

As phase difference the resultant path of particle is an ellipse.

QUESTION: 14

In a simple harmonicmotion, when the displacement is one-half the amplitude, what fraction of the total energy is kinetic? [1996]

Solution:

Total energy of particle executing S.H.M. of amplitude (A).

K.E.of the particle

Clearly ,

[Alt : If the displacement be n times the amplitude, then

QUESTION: 15

A linear harmonic oscillator of force constant 2 × 10^{6} N/m and amplitude 0.01 m has a total mechanical energy of 160 J. Its [1996]

Solution:

k = 2 × 10^{6} N/m

Amplitude (A) = 0.01 m

Total mechanical energy = 160J

As we know that total mechanical energy is equal to total maximum potential energy.

Maximum K. E.

QUESTION: 16

A particle starts simple harmonic motion from the mean position. Its amplitude is A and time period is T.What is its displacement when its speed is half of its maximum speed [1996]

Solution:

[**Alt :** The displacement at which the speed is n times the maximum speed is given by

QUESTION: 17

If the length of a simple pendulum is increased by 2%, then the time period [1997]

Solution:

We know that

If length is increased by 2%., time period increases by 1%.

QUESTION: 18

Two simple harmonic motions with the same frequency act on a particle at right angles i.e., along x and y axis. If the two amplitudes are equal and the phase difference is ω/2, the resultant motion will be [1997]

Solution:

Equation of two simple harmonic motions

....(1)

....(2)

On squaring and adding equations (1) and (2),

x^{2} + y^{2} = A^{2}

This is an equation of a circle. Hence, resulting motion will be a circular motion.

QUESTION: 19

A hollow sphere is filled with water. It is hung by a long thread. As the water flows out of a hole at the bottom, the period of oscillation will [1997]

Solution:

Time period of simple pendulum

where l is effective

length. [i.e distance between centre of suspension and centre of gravity of bob]

Initially, centre of gravity is at the centre of sphere. When water leaks the centre of gravity goes down until it is half filled; then it begins to go up and finally it again goes at the centre. That is effective length first increases and then decreases. As , so time period first increases and then decreases.

QUESTION: 20

Two simple pendulums of length 5m and 20m respectively are given small linear displacement in one direction at the same time. They will again be in the phase when the pendulum of shorter length has completed ....... oscillations [1998]

Solution:

Let the pendulums be in phase after t sec of start. Within this time, if the bigger pendulum executes n oscillations, the smaller one will have executed (n + 1) oscillations.

Now, the time of n oscillation =& the time of (n + 1) oscillation

To be in phase

or, 2n = n + 1

or, n = 1

Hence, the no. of oscillations executed by shorter pendulum = n + 1 = 1 + 1 = 2

QUESTION: 21

A mass m is vertically suspended from a spring of negligible mass; the system oscillates with a frequency n. What will be the frequency of the system, if a mass 4 m is suspended from the same spring? [1998]

Solution:

On putting the value of n we get

QUESTION: 22

The time period of a simple pendulum is 2 seconds. If its length is increased by 4-times, then its period becomes [1999]

Solution:

If is increased by 4 times, time period will increase by two times.

QUESTION: 23

A particle executing S.H.M. has amplitude 0.01m and frequency 60 Hz. The maximum acceleration of the particle is [1999]

Solution:

Amplitude (A) = 0.01 m, Frequency = 60 Hz

Maximum acceleration = Aω^{2} = 0.01 x (2πn)^{2 }

= 0.01 x 4π^{2} x 60 x 60 = 144π^{2} m/sec^{2}

QUESTION: 24

Masses M_{A} and M_{B} hanging from the ends of strings of lengths L_{A} and L_{B} are executing simple harmonic motions. If their frequencies are f_{A} = 2f_{B}, then [2000]

Solution:

regardless of mass.

QUESTION: 25

Two simple harmonic motions act on a particle.

These harmonic motions are x = A cos (ωt + δ), y the resulting motion is [2000]

Solution:

....(1)

When

x = -A sin (ωt + α) ....(2)

Squaring (1) and (2)

and then adding x^{2} + y^{2} = A^{2} [cos^{2} (ωt +α) + sin^{2} (ωt +α)] or x^{2} + y^{2} = A^{2}, which is the equation of a circle.

The present motion is anticlockwise.

QUESTION: 26

A simple pendulum has a metal bob, which is negatively charged. If it is allowed to oscillate above a positively charged metallic plate, then its time period will [2001]

Solution:

We know that the time period (T)

Since the negatively charged bob is attracted by the positively charged plate, therefore acceleration due to gravity will increase and time period will decrease.

QUESTION: 27

There is a body having mass m and performing S.H.M. with amplitude a. There is a restoring force F = –kx. The total energy of body depends upon[2001]

Solution:

Total Energy of body perfor ming simple harmonic motion = where k = mω^{2}

Hence energy depends upon amplitude and k (spring constant).

QUESTION: 28

A body of mass M, executes vertical SHM with periods t_{1} and t_{2}, when separately attached to spring A and spring B respectively. The period of SHM, when the body executes SHM, as shown in the figure is t_{0}. Then [2002]

Solution:

⇒ k = Const.t^{-2}

Here the springs are joined in parallel. So k_{0} = k_{1}+k_{2} where k_{0} is resultant force constant

QUESTION: 29

The amplitude of a pendulum executing damped simple harmonic motion falls to 1/3 the original value after 100 oscillations. The amplitude falls to S times the original value after 200 oscillations, where S is [2002]

Solution:

In damped harmonic oscillator, amplitude falls exponentially.

After 100 oscillations amplitude falls to times.

∴ After next 100 oscillations i.e., after 200 oscillations amplitude falls to times.

QUESTION: 30

A particle is executing a simple harmonic motion of amplitude a. Its potential energy is maximum when the displacement from the position of the maximum kinetic energy is [2002]

Solution:

P.E. of particle executing S.H.M. =

At x = a, P.E. is maximum i.e.

At x = 0, K.E. is maximum.

Hence, displacement from position of maximum Kinetic energy = ±a.

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