50278 + Interview Questions in Physics Page 213 InterviewSolution

10601.	A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer beside the railway track. Which of the following graphs best represents the variation of frequency of sound n heard by the observer with the time t ?[Assume, medium is stationary. Source and observer are collinear]
Answer» A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer beside the railway track. Which of the following graphs best represents the variation of frequency of sound $n$ heard by the observer with the time $t$ ? [Assume, medium is stationary. Source and observer are collinear]

Discussion

10602.	A particle is moving along a straight line. Its velocity varies as v = 6 – 2t where v is in m/s and t inseconds. Find the difference between distance covered and magnitude of displacement in first4 seconds.
Answer» A particle is moving along a straight line. Its velocity varies as v = 6 – 2t where v is in m/s and t in seconds. Find the difference between distance covered and magnitude of displacement in first 4 seconds.

Discussion

10603.	Why centre of mass taken as R−R3 concentric?
Answer» Why centre of mass taken as $R - \frac{R}{3}$ concentric?

Discussion

10604.	A particle of mass 1 kg suffers one - dimensional elastic collision with an unknown mass at rest. It is scattered directly backward by losing 64% of its initial kinetic energy. The unknown mass (in kg) is
Answer» A particle of mass $1 kg$ suffers one - dimensional elastic collision with an unknown mass at rest. It is scattered directly backward by losing $64 %$ of its initial kinetic energy. The unknown mass $(in kg)$ is

Discussion

10605.	44. Inside a neutral metallic spherical shell a charge Q1 is placed and outside the shell a charge Q2 is placed. Then state with REASON that what will happen to electric field inside the shell as well as outside the shell if (1)position of Q1 is changed within the shell keping Q2 fixed (2)position of Q2 is changed outside keeping Q1 fixed inside at any point
Answer» 44. Inside a neutral metallic spherical shell a charge Q1 is placed and outside the shell a charge Q2 is placed. Then state with REASON that what will happen to electric field inside the shell as well as outside the shell if (1)position of Q1 is changed within the shell keping Q2 fixed (2)position of Q2 is changed outside keeping Q1 fixed inside at any point

Discussion

10606.	If two particles A and B , being accelerated through the same p.d. enters an uniform magnetic field and forms circular radii of r1 and r2 , then what will be the mass ratio of A and B ??
Answer» If two particles A and B , being accelerated through the same p.d. enters an uniform magnetic field and forms circular radii of r1 and r2 , then what will be the mass ratio of A and B ??

Discussion

10607.	A black hole is an object whose gravitational field is so strong that even light cannot escape from it to what approximate radius would earth (mass=5.98×10^{26} Kg ) have to be compressed to be a black hole
Answer» A black hole is an object whose gravitational field is so strong that even light cannot escape from it to what approximate radius would earth (mass=5.98×10^{26} Kg ) have to be compressed to be a black hole

Discussion

10608.	Two bodies of masses m and 4m are moving with equal K.E. The ratio of their linear momenta is
Answer» Two bodies of masses $m$ and $4 m$ are moving with equal $K . E$ . The ratio of their linear momenta is

Discussion

10609.	a=3t-4t^2 and t=1 Find velocity and position.
Answer» a=3t-4t^2 and t=1 Find velocity and position.

Discussion

10610.	The radius of gyration of a compound pendulum about the point of suspension is 100 mm. The distance between the point suspension and the centre of mass is 250 mm. Considering the acceleration die to gravity is 9,81 m/s 2, the natural frequency (in radian/s) of the compound pendulum is
Answer» The radius of gyration of a compound pendulum about the point of suspension is 100 mm. The distance between the point suspension and the centre of mass is 250 mm. Considering the acceleration die to gravity is 9,81 m/s $^{2}$ , the natural frequency (in radian/s) of the compound pendulum is

Discussion

10611.	Why resistivity does not depend upon length and area of cross section? Explain in detail
Answer» Why resistivity does not depend upon length and area of cross section? Explain in detail

Discussion

10612.	The current voltage relation of diode is given by I=(e1000VT–1) mA, where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error of ±0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?
Answer» The current voltage relation of diode is given by $I = (e^{\frac{1000 V}{T}} - 1) mA$ , where the applied voltage $V$ is in volts and the temperature $T$ is in degree Kelvin. If a student makes an error of $\pm 0.01 V$ while measuring the current of $5 mA$ at $300 K$ , what will be the error in the value of current in $mA$ ?

Discussion

10613.	The degree of static indeterminacy of the plane frame is shown in the figure is______15
Answer» The degree of static indeterminacy of the plane frame is shown in the figure is______ 15

Discussion

10614.	whether diverging lens can acts as converging lens?
Answer» whether diverging lens can acts as converging lens?

Discussion

10615.	138.Acceleration versus time graph is given. Velocity of the particle are equal at
Answer» 138.Acceleration versus time graph is given. Velocity of the particle are equal at

Discussion

10616.	A high Q coil having distributed (self) capacitance is tested with a Q-meter. First resonance at ω1=106 rad/s is obtained with a capacitance of 990 pF. The second resonance at ω2=2×106 rad/s is obtained with a 240 pF capacitance. The value of the inductance (in mH) of the coil is (up to one decimal place)1
Answer» A high Q coil having distributed (self) capacitance is tested with a Q-meter. First resonance at $ω_{1} = 10^{6}$ rad/s is obtained with a capacitance of 990 pF. The second resonance at $ω_{2} = 2 \times 10^{6}$ rad/s is obtained with a 240 pF capacitance. The value of the inductance (in mH) of the coil is (up to one decimal place) 1

Discussion

10617.	For which of the following forces, the torque about the origin is zero, if force is applied at →r=8^i m?
Answer» For which of the following forces, the torque about the origin is zero, if force is applied at $\to r = 8^i m$ ?

Discussion

10618.	A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him and gravity on the luggage respectively. Take acceleration due to gravity=10ms−2.
Answer» A man lifts a luggage of $10 k g$ from the ground and puts it on his head $1.7 m$ above the ground. Calculate work done by him and gravity on the luggage respectively. Take acceleration due to gravity $= 10 m s^{- 2}$ .

Discussion

10619.	Magnetic flux (ϕ) linked through the coil changes with respect to time (t) according to following graph, then induced emf (e) v/s time(t) graph for coil is:
Answer» Magnetic flux $(ϕ)$ linked through the coil changes with respect to time $(t)$ according to following graph, then induced emf $(e)$ v/s time $(t)$ graph for coil is:

Discussion

10620.	A resistance of 20 Ω is connected to a source of alternating current rated 110 V,50 Hz. Find the rms current.
Answer» A resistance of $20 Ω$ is connected to a source of alternating current rated $110 V, 50 Hz$ . Find the rms current.

Discussion

10621.	One train is approaching an observer at rest and another train is receeding from him with the same velocity 4 m/s. Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air is 320 m/s).
Answer» One train is approaching an observer at rest and another train is receeding from him with the same velocity $4 m/s$ . Both the trains blow whistles of same frequency of $243 Hz$ . The beat frequency in $Hz$ as heard by the observer is (speed of sound in air is $320 m/s$ ).

Discussion

10622.	The moment of the force, →F = 4ˆi + 5ˆj −6ˆk at (2, 0, –3) about the point (2, –2, –2) is given by
Answer» The moment of the force, $\to F = 4 ˆ i + 5 ˆ j - 6 ˆ k$ at $(2, 0, - 3)$ about the point $(2, - 2, - 2)$ is given by

Discussion

10623.	17. How To Find Neutal Point In Electrostatics
Answer» 17. How To Find Neutal Point In Electrostatics

Discussion

10624.	A toroid has inner radius of 5 cm and outer radius of 8 cm. A point P is located inside the toroid at a distance of 5.5 cm from the center of the toroid. The toroid carries a current I and magnetic field at point P is equal to B due to this current. If the toroid suddenly shrinks such that its inner radius becomes 3.5 cm and outer radius becomes 7 cm, keeping the current and number of turns same. What will be the value of magnetic field at point P in the later case ?
Answer» A toroid has inner radius of $5 cm$ and outer radius of $8 cm$ . A point $P$ is located inside the toroid at a distance of $5.5 cm$ from the center of the toroid. The toroid carries a current $I$ and magnetic field at point $P$ is equal to $B$ due to this current. If the toroid suddenly shrinks such that its inner radius becomes $3.5 cm$ and outer radius becomes $7 cm$ , keeping the current and number of turns same. What will be the value of magnetic field at point $P$ in the later case ?

Discussion

10625.	A rod PQ of length 2l is rotating in the horizontal plane about one end P in a uniform vertical magnetic field B. Point M is the midpoint of the rod. Find the induced emf between M and Q if that between P and Q is 100 V.
Answer» A rod $P Q$ of length $2 l$ is rotating in the horizontal plane about one end $P$ in a uniform vertical magnetic field $B$ . Point $M$ is the midpoint of the rod. Find the induced emf between $M$ and $Q$ if that between $P$ and $Q$ is $100 V$ .

Discussion

10626.	What is the wavelength of an electromagnetic wave of time period 0.2 ns?
Answer» What is the wavelength of an electromagnetic wave of time period 0.2 ns?

Discussion

10627.	Two charges –q and +q are located at points (0, 0, –a) and (0, 0, a),respectively. (a) What is the electrostatic potential at the points (0, 0, z) and(x, y, 0) ? (b) Obtain the dependence of potential on the distance r of a pointfrom the origin when r/a >> 1. (c) How much work is done in moving a small test charge from thepoint (5,0,0) to (–7,0,0) along the x-axis? Does the answerchange if the path of the test charge between the same points is not along the x-axis?
Answer» Two charges –q and +q are located at points (0, 0, –a) and (0, 0, a),respectively. (a) What is the electrostatic potential at the points (0, 0, z) and(x, y, 0) ? (b) Obtain the dependence of potential on the distance r of a pointfrom the origin when r/a >> 1. (c) How much work is done in moving a small test charge from thepoint (5,0,0) to (–7,0,0) along the x-axis? Does the answerchange if the path of the test charge between the same points is not along the x-axis?

Discussion

10628.	Find the magnitude of →B, if →B makes an angle of 53∘ West of North and →C makes an angle of 37∘ North of East and →A has magnitude equal to 12 and →C has magnitude equal to 10. (Given →A+→B+→C=0), [Hint √5184=72]
Answer» Find the magnitude of $\to B$ , if $\to B$ makes an angle of $53^{\circ}$ West of North and $\to C$ makes an angle of $37^{\circ}$ North of East and $\to A$ has magnitude equal to $12$ and $\to C$ has magnitude equal to $10$ . (Given $\to A + \to B + \to C = 0$ ), [Hint $\sqrt{5184} = 72$ ]

Discussion

10629.	A body of mass 40 kg having velocity 4 m/s collides with another body of mass 60 kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be
Answer» A body of mass 40 kg having velocity 4 m/s collides with another body of mass 60 kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be

Discussion

10630.	A force →F=(2x^i+3y2^j) N acts on a body and displaces it from the origin (0,0) to (2 m,4 m).The work done (in J) by the force is
Answer» A force $\to F = (2 x^i + 3 y^{2}^j) N$ acts on a body and displaces it from the origin $(0, 0)$ to $(2 m, 4 m)$ .The work done (in $J$ ) by the force is

Discussion

10631.	what happens wen electricity is passed in acidified water? what ore the end products obtained in anode and cathode
Answer» what happens wen electricity is passed in acidified water? what ore the end products obtained in anode and cathode

Discussion

10632.	The acceleration versus velocity graph of a particle moving in a straight line starting from rest is as shown in the figure. The corresponding velocity-time graph may be
Answer» The acceleration versus velocity graph of a particle moving in a straight line starting from rest is as shown in the figure. The corresponding velocity-time graph may be

Discussion

10633.	33.A block of mass m =2kg is resting on the rough inclined plane of inclination 30degree. The coefficient of friction between the block and the plane is 0.5.What minimum force F should be applied perpendicular to the plane on the block, so that block does not slip on the plane
Answer» 33.A block of mass m =2kg is resting on the rough inclined plane of inclination 30degree. The coefficient of friction between the block and the plane is 0.5.What minimum force F should be applied perpendicular to the plane on the block, so that block does not slip on the plane

Discussion

10634.	Suppose that a rigid body is free to rotate about a fixed point O. If a force →F acts on the body at a point P, then the body will tend to rotate about an axis through O. This effect is measured by the torque vector t which is given by →t=→r×→F. Where →r is the position vector −−→OP. The straight line through O determined by →t is the axis of rotation. The vector →r,→F and →T form a right handed system. A bolt is being tightened by a 20N force is applied to a 25 cm long wrench at an angle of 600 with the wrench. The magnitude of torque is
Answer» Suppose that a rigid body is free to rotate about a fixed point $O$ . If a force $\to F$ acts on the body at a point $P$ , then the body will tend to rotate about an axis through $O$ . This effect is measured by the torque vector $t$ which is given by $\to t = \to r \times \to F$ . Where $\to r$ is the position vector $- - \to O P$ . The straight line through $O$ determined by $\to t$ is the axis of rotation. The vector $\to r, \to F$ and $\to T$ form a right handed system. A bolt is being tightened by a $20 N$ force is applied to a $25 c m$ long wrench at an angle of $60^{0}$ with the wrench. The magnitude of torque is

Discussion

10635.	In the circuit shown in the figure, the input voltage Vi is 20 V, VBE=0 V and VCE=0 V. The value of IB is given by
Answer» In the circuit shown in the figure, the input voltage $V_{i}$ is $20 V$ , $V_{B E} = 0 V$ and $V_{C E} = 0 V$ . The value of $I_{B}$ is given by

Discussion

10636.	A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance
Answer» A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance

Discussion

10637.	what does "one unit of time" mean?
Answer» what does "one unit of time" mean?

Discussion

10638.	A body of mass m is tied to one end of spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is one centimeter. If the angular velocity is doubled, the elongation in spring is 5 cm. The original length L of spring (in cm ) is
Answer» A body of mass $m$ is tied to one end of spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is one centimeter. If the angular velocity is doubled, the elongation in spring is 5 $c m$ . The original length $L$ of spring (in $c m$ ) is

Discussion

10639.	Derivation of equation of motion
Answer» Derivation of equation of motion

Discussion

10640.	A thief jumps from the roof of a house with a box of 3kg on his head. What will be the weight of the box as experienced by the thief during the jump?
Answer» A thief jumps from the roof of a house with a box of 3kg on his head. What will be the weight of the box as experienced by the thief during the jump?

Discussion

10641.	A light ray falling at an angle of 45∘ with the surface of a clean slabof ice of thickness 1.00 m is refracted into it at an angle of 30∘. Calculate the time taken by the light rays to cross the slab. Speed of light in vacuum =3×108 ms−1
Answer» A light ray falling at an angle of $45^{\circ}$ with the surface of a clean slabof ice of thickness 1.00 m is refracted into it at an angle of $30^{\circ}$ . Calculate the time taken by the light rays to cross the slab. Speed of light in vacuum $= 3 \times 10^{8} m s^{- 1}$

Discussion

10642.	Find the percentage decreases in the accleration due to gravity when a body is taken from the surface of earth to a height of 64km from its surface
Answer» Find the percentage decreases in the accleration due to gravity when a body is taken from the surface of earth to a height of 64km from its surface

Discussion

10643.	Three concentric spherical conductors A ,B and C of radii R, 2R and 4R respectively. A and C is shorted and B is uniformly charged +Q. Find potential of B
Answer» Three concentric spherical conductors A ,B and C of radii R, 2R and 4R respectively. A and C is shorted and B is uniformly charged +Q. Find potential of B

Discussion

10644.	Light of intensity ‘I’ and frequency ‘v’ is incident on a photosensitive surface and causes photoelectric emission. What will be the effect on anode current when (i) the intensity of light is gradually increased, (ii) the frequency of incident radiation is increased, and (iii) the anode potential is increased? In each case, all other factors remain the same. Explain, giving justification in each case
Answer» Light of intensity ‘I’ and frequency ‘v’ is incident on a photosensitive surface and causes photoelectric emission. What will be the effect on anode current when (i) the intensity of light is gradually increased, (ii) the frequency of incident radiation is increased, and (iii) the anode potential is increased? In each case, all other factors remain the same. Explain, giving justification in each case

10644.

Light of intensity ‘I’ and frequency ‘v’ is incident on a photosensitive surface and causes photoelectric emission. What will be the effect on anode current when (i) the intensity of light is gradually increased, (ii) the frequency of incident radiation is increased, and (iii) the anode potential is increased? In each case, all other factors remain the same. Explain, giving justification in each case

Answer»

Light of intensity ‘I’ and frequency ‘v’ is incident on a photosensitive surface and causes photoelectric emission. What will be the effect on anode current when (i) the intensity of light is gradually increased, (ii) the frequency of incident radiation is increased, and (iii) the anode potential is increased? In each case, all other factors remain the same.

Explain, giving justification in each case

Discussion

10645.	Abody of mass 0.5 kg travels in a straight line with velocitywhere.What is the work done by the net force during its displacement from x= 0 to x= 2 m?
Answer» A body of mass 0.5 kg travels in a straight line with velocity where. What is the work done by the net force during its displacement from x = 0 to x = 2 m?

Discussion

10646.	what is stoping potential and maximum saturation current
Answer» what is stoping potential and maximum saturation current

Discussion

10647.	For a transistor amplifier, the voltage gain (a) remains constant for all frequencies. (b) is high at high and low frequencies and constant in the middle frequency range. (c) is low at high and low frequencies and constant at mid frequencies. (d) None of the above.
Answer» For a transistor amplifier, the voltage gain (a) remains constant for all frequencies. (b) is high at high and low frequencies and constant in the middle frequency range. (c) is low at high and low frequencies and constant at mid frequencies. (d) None of the above.

Discussion

10648.	A wave pulse starts propagating in the positive x− direction along a non-uniform wire of length 10 m with a mass per unit length given by m=m0+αx and under a tension of 100 N. Find the time taken by the pulse in seconds to travel from the lighter end x=0 to the heavier end. (m0=10−2 kg/m and α=9×10−3 kg/m2). Answer upto 2 decimal places.
Answer» A wave pulse starts propagating in the positive $x -$ direction along a non-uniform wire of length $10 m$ with a mass per unit length given by $m = m_{0} + α x$ and under a tension of $100 N$ . Find the time taken by the pulse in seconds to travel from the lighter end $x = 0$ to the heavier end. ( $m_{0} = 10^{- 2} kg/m$ and $α = 9 \times 10^{- 3} {kg/m}^{2}$ ). Answer upto 2 decimal places.

Discussion

10649.	A monochromatic light is incident from air on a refracting surface of a prism of angle 75o and refractive index n0=√3. The other refracting surface of the prism is coated by a thin film of material of refractive index n as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of θ≤60o. The value of n2 is .
Answer» A monochromatic light is incident from air on a refracting surface of a prism of angle $75^{o}$ and refractive index $n_{0} = \sqrt{3}$ . The other refracting surface of the prism is coated by a thin film of material of refractive index n as shown in figure. The light suffers total internal reflection at the coated prism surface for an incidence angle of $θ \leq 60^{o}$ . The value of $n^{2}$ is .

Discussion

10650.	A square loop of edge a=20 cm made of uniform wire is as shown in the figure below. If current i=5 A is entering into the system at A and leaves at C. Find the magnetic field (approximately) at point P which is on perpendicular bisector of AB (inside the loop) at a distance 5 cm from it.
Answer» A square loop of edge $a = 20 cm$ made of uniform wire is as shown in the figure below. If current $i = 5 A$ is entering into the system at $A$ and leaves at $C$ . Find the magnetic field (approximately) at point $P$ which is on perpendicular bisector of $AB$ (inside the loop) at a distance $5 cm$ from it.

Discussion

Explore topic-wise InterviewSolutions in .

A particle is moving along a straight line. Its velocity varies as v = 6 – 2t where v is in m/s and t inseconds. Find the difference between distance covered and magnitude of displacement in first4 seconds.

Why centre of mass taken as R−R3 concentric?

A particle of mass 1 kg suffers one - dimensional elastic collision with an unknown mass at rest. It is scattered directly backward by losing 64% of its initial kinetic energy. The unknown mass (in kg) is

If two particles A and B , being accelerated through the same p.d. enters an uniform magnetic field and forms circular radii of r1 and r2 , then what will be the mass ratio of A and B ??

A black hole is an object whose gravitational field is so strong that even light cannot escape from it to what approximate radius would earth (mass=5.98×10^{26} Kg ) have to be compressed to be a black hole

Two bodies of masses m and 4m are moving with equal K.E. The ratio of their linear momenta is

a=3t-4t^2 and t=1 Find velocity and position.

The radius of gyration of a compound pendulum about the point of suspension is 100 mm. The distance between the point suspension and the centre of mass is 250 mm. Considering the acceleration die to gravity is 9,81 m/s 2, the natural frequency (in radian/s) of the compound pendulum is

Why resistivity does not depend upon length and area of cross section? Explain in detail

The current voltage relation of diode is given by I=(e1000VT–1) mA, where the applied voltage V is in volts and the temperature T is in degree Kelvin. If a student makes an error of ±0.01 V while measuring the current of 5 mA at 300 K, what will be the error in the value of current in mA?

The degree of static indeterminacy of the plane frame is shown in the figure is______15

whether diverging lens can acts as converging lens?

138.Acceleration versus time graph is given. Velocity of the particle are equal at

For which of the following forces, the torque about the origin is zero, if force is applied at →r=8^i m?

A man lifts a luggage of 10kg from the ground and puts it on his head 1.7m above the ground. Calculate work done by him and gravity on the luggage respectively. Take acceleration due to gravity=10ms−2.

Magnetic flux (ϕ) linked through the coil changes with respect to time (t) according to following graph, then induced emf (e) v/s time(t) graph for coil is:

A resistance of 20 Ω is connected to a source of alternating current rated 110 V,50 Hz. Find the rms current.

One train is approaching an observer at rest and another train is receeding from him with the same velocity 4 m/s. Both the trains blow whistles of same frequency of 243 Hz. The beat frequency in Hz as heard by the observer is (speed of sound in air is 320 m/s).

The moment of the force, →F = 4ˆi + 5ˆj −6ˆk at (2, 0, –3) about the point (2, –2, –2) is given by

17. How To Find Neutal Point In Electrostatics

A rod PQ of length 2l is rotating in the horizontal plane about one end P in a uniform vertical magnetic field B. Point M is the midpoint of the rod. Find the induced emf between M and Q if that between P and Q is 100 V.

What is the wavelength of an electromagnetic wave of time period 0.2 ns?

Find the magnitude of →B, if →B makes an angle of 53∘ West of North and →C makes an angle of 37∘ North of East and →A has magnitude equal to 12 and →C has magnitude equal to 10. (Given →A+→B+→C=0), [Hint √5184=72]

A body of mass 40 kg having velocity 4 m/s collides with another body of mass 60 kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy will be

A force →F=(2x^i+3y2^j) N acts on a body and displaces it from the origin (0,0) to (2 m,4 m).The work done (in J) by the force is

what happens wen electricity is passed in acidified water? what ore the end products obtained in anode and cathode

The acceleration versus velocity graph of a particle moving in a straight line starting from rest is as shown in the figure. The corresponding velocity-time graph may be

33.A block of mass m =2kg is resting on the rough inclined plane of inclination 30degree. The coefficient of friction between the block and the plane is 0.5.What minimum force F should be applied perpendicular to the plane on the block, so that block does not slip on the plane

In the circuit shown in the figure, the input voltage Vi is 20 V, VBE=0 V and VCE=0 V. The value of IB is given by

A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance

what does "one unit of time" mean?

A body of mass m is tied to one end of spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is one centimeter. If the angular velocity is doubled, the elongation in spring is 5 cm. The original length L of spring (in cm ) is

Derivation of equation of motion

A thief jumps from the roof of a house with a box of 3kg on his head. What will be the weight of the box as experienced by the thief during the jump?

A light ray falling at an angle of 45∘ with the surface of a clean slabof ice of thickness 1.00 m is refracted into it at an angle of 30∘. Calculate the time taken by the light rays to cross the slab. Speed of light in vacuum =3×108 ms−1

Find the percentage decreases in the accleration due to gravity when a body is taken from the surface of earth to a height of 64km from its surface

Three concentric spherical conductors A ,B and C of radii R, 2R and 4R respectively. A and C is shorted and B is uniformly charged +Q. Find potential of B

Abody of mass 0.5 kg travels in a straight line with velocitywhere.What is the work done by the net force during its displacement from x= 0 to x= 2 m?

what is stoping potential and maximum saturation current

For a transistor amplifier, the voltage gain (a) remains constant for all frequencies. (b) is high at high and low frequencies and constant in the middle frequency range. (c) is low at high and low frequencies and constant at mid frequencies. (d) None of the above.

A square loop of edge a=20 cm made of uniform wire is as shown in the figure below. If current i=5 A is entering into the system at A and leaves at C. Find the magnetic field (approximately) at point P which is on perpendicular bisector of AB (inside the loop) at a distance 5 cm from it.