Recent questions in Physics

The equivalent spring constant of the system is

asked Mar 11, 2014 by yamini.v

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The equivalent spring constant for the system is

asked Mar 11, 2014 by yamini.v

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A light string of mass m and length L has its ends tied to two walls that are separated by the distance D. Two objects each of mass M are suspended from the string as shown in figure. if a wave pulse is sent from point A how long does it take to reach point B?

asked Mar 11, 2014 by yamini.v

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A rid of length l and mass is fixed at point O as shown in the figure and it is free to rotate about that point . Find the frequency (w) for small angular oscillation

asked Mar 11, 2014 by yamini.v

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If the per of human ear is 0.4 s and the minimum distance for an echo is 50 m . Then find the speed of sound in the medium

asked Mar 11, 2014 by yamini.v

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Ram pedals a stationary bicycle whose pedals are attached to a 1000 turn coil of area 0.10 $m^2$ . The coil rotates at half a revolution per second and it is placed in a uniform magnetic field of 0.01 T perpendicular to the axis of rotation of the coil. What is the maximum voltage generated in the coil?

asked Mar 10, 2014 by balaji.thirumalai

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A wheel with 10 metallic spokes each 0.3 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field $H_E$ at a place. If $H_E$ = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = $10^{–4}$ T.

asked Mar 10, 2014 by balaji.thirumalai

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A light string with a mass per unit length of 8.00 g/m has its ends tied to two walls separated by distance equal to three - fourth the length of the string .An object of mass m is suspended from the center of the string , putting a tension in the string then transverse wave speed in the string as a function of hanging mass

asked Mar 10, 2014 by yamini.v

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A wheel with 10 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth’s magnetic field $H_E$ at a place. If $H_E$ = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel? Note that 1 G = $10^{–4}$ T.

asked Mar 10, 2014 by balaji.thirumalai

1 answer

A metallic rod of 1 m length is rotated with a frequency of 100 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through the centre and perpendicular to the plane of the ring (see fig). A constant and uniform magnetic field of 1 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

asked Mar 10, 2014 by balaji.thirumalai

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A metallic rod of 1 m length is rotated with a frequency of 50 rev/s, with one end hinged at the centre and the other end at the circumference of a circular metallic ring of radius 1 m, about an axis passing through the centre and perpendicular to the plane of the ring (see fig). A constant and uniform magnetic field of 1 T parallel to the axis is present everywhere. What is the emf between the centre and the metallic ring?

asked Mar 10, 2014 by balaji.thirumalai

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A point source emits sound waves with an average power out-put of 8.0 w .Then find intensity at 3.0 m & distance at which the sound level is 40 dB

asked Mar 10, 2014 by yamini.v

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There is friction between M and ground and $\;(\mu_{s}=0.5)\;$ . There is no friction between m and ground . Find the maximum amplitude of S.H.M with which the block m vibrates so that the block M does not move ? $\;(g=10 m/s^2)$

asked Mar 10, 2014 by yamini.v

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A circular coil of radius $10\; cm, 500$ turns and resistance $2 \;\Omega$ is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through $180^{\circ}$ in $0.25\; s$ . Estimate the magnitudes of the emf and current induced in the coil. Horizontal component of the earth’s magnetic field at the place is $3.0 × 10^{–5}$ T.

asked Mar 10, 2014 by balaji.thirumalai

1 answer

A square loop of side 10 cm and resistance 0.5 $\Omega$ is placed vertically in the east-west plane. A uniform magnetic field of 0.10 T is set up across the plane in the north-east direction. The magnetic field is decreased to zero in 0.70 s at a steady rate. Determine the magnitudes of induced emf $\varepsilon$ and current $I$ during this time-interval.

asked Mar 10, 2014 by balaji.thirumalai

1 answer

Two plates each of area A, thicknesses L1 and L2 and thermal conductivities K1 and K2 are joined to form a single plate of thickness (L1 + L2). If the temperatures of the free surfaces are T1 and T2,Find the equivalent thermal conductivity:

asked Mar 10, 2014 by balaji.thirumalai

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Two plates each of area A, thicknesses L1 and L2 and thermal conductivities K1 and K2 are joined to form a single plate of thickness (L1 + L2). If the temperatures of the free surfaces are T1 and T2, Find the temperature of interface:

asked Mar 10, 2014 by balaji.thirumalai

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Find the frequency heard by the observer if velocity of observer = 15 m/s, velocity of source = 20 m/s, frequency of sound source = 400 Hz and velocity of sound waves = 340 Hz

asked Mar 10, 2014 by yamini.v

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Two plates each of area A, thicknesses L1 and L2 and thermal conductivities K1 and K2 are joined to form a single plate of thickness (L1 + L2). If the temperatures of the free surfaces are T1 and T2, Find the rate of flow of heat:

asked Mar 10, 2014 by balaji.thirumalai

1 answer

A block of mass '3 Kg' is dropped from a height of $\;\large\frac{10}{3}\;$ mts onto a mass '7 Kg' which is attached to spring of spring constant 3 N/m initially at rest . The 3 Kg mass sticks to the 7 Kg mass and then the spring starts to stretch . Find the maximum extension of the spring . (Consider inelastic collision (e=0))

asked Mar 10, 2014 by yamini.v

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Eight blocks of masses m , 2m , 3m ,------,8m are placed on a table as shown in the figure .The table is smooth . The block 'm' is given a velocity $\;v_{0}\;$ which inturn hits '2m' and the process continues and finally the systems sticks to a spring of spring constant $\;K_{1}\;$ . Find the angular frequency (w) of the system . (Consider all collisions to be inelastic e=0 )

asked Mar 10, 2014 by yamini.v

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In the system shown the mass is at the centre on the turnatable is rotated at a constant angular speed 'w' . The equilibrium position is at (Consider the right side as positive x - axis and the springs are initially unstretched )

asked Mar 10, 2014 by yamini.v

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A disc of mass 'm' and radius 'r' is present on a rough surface . Find the angular frequency (w) of the S.H.M . Consider pure rolling of the disc

asked Mar 10, 2014 by yamini.v

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Find the time period of S.H.M for the following spring - mass system

asked Mar 9, 2014 by yamini.v

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A sound source of frequency 400 Hz is moving towards an observer with a velocity of 50 m/s while the observer is moving away from the source with a velocity of 40 m/s . Find the frequency heard by the observer . (Velocity of sound is 340 m/s )

asked Mar 9, 2014 by yamini.v

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A hollow sphere is tied to string and the system acts like a simple pendulum . Let the time period of the system be T . By doing which of the following , the time period of the system increases . (Do not consider extension of the string due to mass ) .

asked Mar 9, 2014 by yamini.v

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The system shown find the angular frequency (w) oscillation for S.H.M .

asked Mar 9, 2014 by yamini.v

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In an S.H.M if amplitude is 3 m and spring constant is 3 N/m and maximum velocity is 3 m/s , find the angular frequency (w) ?

asked Mar 9, 2014 by yamini.v

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Two sinusoidal machines are positioned the same distance from a worker . The intensity of sound delivered by each machine at the location of the worker is $\;2.0 \times 10^{-7}\;w/m^2\;$ . Find the sound level heard by the worker (i) when one machine is operating (ii) when both machines are operating

asked Mar 8, 2014 by yamini.v

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The sound source of frequency 400 Hz is moving towards as stationary observer with a velocity of 40 m/s . The frequency heard by the observer is (The speed of sound in medium is 340 Hz .)

asked Mar 8, 2014 by yamini.v

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An observer is moving towards a stationary source of frequency 320 Hz with a velocity of 10 m/s . The speed of sound in air is 343 m/s . The new frequency heard by the observer is

asked Mar 8, 2014 by yamini.v

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The intensity of a sound wave is $\;10^{-6}\;w/m^2\;$ . The speed of the sound wave is 343 m/s . The intensity of the medium is $\;1.2\;Kg/m^3\;$ . Find the $\;(\bigtriangleup p_{max})\;$ pressure amplitude of the sound wave

asked Mar 8, 2014 by yamini.v

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Sinusoidal waves 6 cm in amplitude are to be transmitted along a string that has a linear mass density of $\;4 \times 10^{-2} Kg/m\;$ . If the source can deliver a maximum power of 400 W and the string is under a tension of 100 N , what is the highest vibrational frequency at which the source can operate

asked Mar 8, 2014 by yamini.v

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A taut string for which $\;\mu=5\times 10^{-2} \;Kg/m\;$ is under as tension of 80 N . How much power must be supplied to the string to generate a sinusoidal wave at a frequency of 60 Hz and an amplitude of 6 cm ?

asked Mar 8, 2014 by yamini.v

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A spring-mass system is released from rest as shown in the figure . Initially the spring is unstretched . The equilibrium position of the system is at distance of from the initial state . $\;(g=10\;m/s^2)$

asked Mar 8, 2014 by yamini.v

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An ideal spring - mass system is oscillating . The one which remains some during the entire S.H.M period is

asked Mar 7, 2014 by yamini.v

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The time taken by a particle in S.H.M to reach from equilibrium position to one end is 25 s . The angular frequency w is

asked Mar 7, 2014 by yamini.v

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Which of the following is an example of S.H.M ( simple harmonic motion ) ?

asked Mar 7, 2014 by yamini.v

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The time period of a single pendulum is dependent on

asked Mar 7, 2014 by yamini.v

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A wave equation is given by $\;x_{1}=A \sin w(t-\large\frac{x}{K})\;$ where A is in mts , w is in Hz , x is in mts . The units of k are

asked Mar 7, 2014 by yamini.v

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Two waves of amplitudes 3 mts and 9 mts interfere . The resulting amplitude cannot be

asked Mar 7, 2014 by yamini.v

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4 waves $\;x_{1}=4 \sin5t\;, x_{2}= 8 \sin 5t\;, x_{3}=\cos 5t \;and\;x_{4}=4 \cos 5t \;$ interfere and if the final equation can be written in the form of $\;A \sin (5t+\sin^{-1}(\large\frac{B}{c}))\;$ , what is the sum of $\;A+B+C$ ?

asked Mar 7, 2014 by yamini.v

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The wave equation of 2 waves are given by $\;x_{1}=4 \sin 3t\; mts\;$ and $\;x_{2}=3 \cos 3t \;mts \;.$ The amplitude of the resulting wave is

asked Mar 7, 2014 by yamini.v

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The equation of motion of a particle is given by $x=4 sin(3t)$ mts where t is in seconds . The velocity of the particle at t=0 s is

asked Mar 7, 2014 by yamini.v

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20 waves of amplitudes 1 , 2 ...... , 9 , 20 mts are interfered . Maximum amplitude of the resulting wave is

asked Mar 7, 2014 by yamini.v

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In figure a block of mass 100 kg tied to a string of linear mass density 0.1 Kg/m . Find the frequency of the wave on the string if the length of the string is 2 mts ?

asked Mar 7, 2014 by yamini.v

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In figure a block of mass 100 kg tied to a string of linear mass density 0.1 Kg/m . Find the velocity of wave produced in the string ? (neglect string mass) $\;(g=10\;m/s^{2})$

asked Mar 7, 2014 by yamini.v

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A wave is reflected from a rigid support . The change of phase on reflection will be

asked Mar 7, 2014 by yamini.v

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Mr.A's voice has more frequency than Mr.B's voice . The velocity of Mr.A's voice is ------- than Mr.B's voice

asked Mar 7, 2014 by yamini.v

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At a pressure of 10 atm , the density of a certain gas is $\;1.4\times10^{-3}\;gm/cm\;$ . If the specific heat ratio for this gas is 1.4 , the velocity of sound in this gas is

asked Mar 7, 2014 by yamini.v

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