3731 + Interview Questions in Physics Page 74 InterviewSolution

3651.	If the velocity head of a stream of water is equal to 10 cm, then its speed of flow is approximately
Answer» If the velocity head of a stream of water is equal to $10 cm$ , then its speed of flow is approximately

Discussion

3652.	If a body travels half its total path in the last second of its fall from rest, find the time of its fall. Take g=10 m/s2.
Answer» If a body travels half its total path in the last second of its fall from rest, find the time of its fall. Take $g = 10 {m/s}^{2}$ .

Discussion

3653.	A sonometer wire resonates with a given tuning fork, forming standing waves with five antinodes between the two bridges when a mass of 9 kg is suspended from the wire. When a mass of M kg is suspended from the wire, the same tuning fork causes the wire to form three antinodes for the same positions of the bridges. What is the value of M?
Answer» A sonometer wire resonates with a given tuning fork, forming standing waves with five antinodes between the two bridges when a mass of $9 kg$ is suspended from the wire. When a mass of $M kg$ is suspended from the wire, the same tuning fork causes the wire to form three antinodes for the same positions of the bridges. What is the value of $M$ ?

Discussion

3654.	If characteristic gas constant of a given gas is one fourth of universal gas constant, the given gas could be
Answer» If characteristic gas constant of a given gas is one fourth of universal gas constant, the given gas could be

Discussion

3655.	One mole of an ideal gas is kept enclosed under a light piston of area A=10−2 m2 which is connected to a compressed spring of spring constant 100 N/m. The volume of the gas is 0.83 m3 and its temperature is 100 K. The gas is heated so that it compresses the spring further by 0.1 m. The work done by the gas in the process is: [TakeR=8.3 J/K mol and suppose there is no atmosphere].
Answer» One mole of an ideal gas is kept enclosed under a light piston of area $A = 10^{- 2} m^{2}$ which is connected to a compressed spring of spring constant $100 N/m$ . The volume of the gas is $0.83 m^{3}$ and its temperature is $100 K$ . The gas is heated so that it compresses the spring further by $0.1 m$ . The work done by the gas in the process is: [Take $R = 8.3 J/K mol$ and suppose there is no atmosphere].

Discussion

3656.	The height at which the acceleration due to gravity becomes g9 (where g = the acceleration due to gravity on the surface of th earth) in terms of R, radius of the earth is
Answer» The height at which the acceleration due to gravity becomes $\frac{g}{9}$ (where g = the acceleration due to gravity on the surface of th earth) in terms of $R$ , radius of the earth is

Discussion

3657.	Figure shows two rods p & q moving with a same velocity of 2 m/s perpendicular to their length. If angle between the rods is 106∘, velocity of point of intersection (in m/s) is.
Answer» Figure shows two rods p & q moving with a same velocity of $2 m/s$ perpendicular to their length. If angle between the rods is $106^{\circ}$ , velocity of point of intersection (in $m/s$ ) is.

Discussion

3658.	Two particles A and B are projected simultaneously with velocities VA=11 m/s and VB=15 m/s as shown in the figure. Find the time (in seconds) when they collide.
Answer» Two particles A and B are projected simultaneously with velocities $V_{A} = 11 m/s$ and $V_{B} = 15 m/s$ as shown in the figure. Find the time (in seconds) when they collide.

Discussion

3659.	Magnitude of resultant of 3 vectors −−→OA, −−→OB, and −−→OC as shown below is
Answer» Magnitude of resultant of $3$ vectors $- - \to O A, - - \to O B$ , and $- - \to O C$ as shown below is

Discussion

3660.	1 mole of real gas (a=1.4) occupies a volume of 0.1 L at 300 K, then what will be the pressure of gas?
Answer» $1$ mole of real gas $(a = 1.4)$ occupies a volume of $0.1 L$ at $300 K$ , then what will be the pressure of gas?

Discussion

3661.	In the given figure, equivalent resistance between A and B will be
Answer» In the given figure, equivalent resistance between A and B will be

Discussion

3662.	Fig. Shows the vertical section of a frictionless surface. A block of mass 2 kg is released from rest from position A; its KE as it reaches position C is (g=10ms−2)
Answer» Fig. Shows the vertical section of a frictionless surface. A block of mass 2 kg is released from rest from position A; its KE as it reaches position C is $(g = 10 m s^{- 2})$

3662.

Fig. Shows the vertical section of a frictionless surface. A block of mass 2 kg is released from rest from position A; its KE as it reaches position C is (g=10ms−2)

Answer»

Fig. Shows the vertical section of a frictionless surface. A block of mass 2 kg is released from rest from position A; its KE as it reaches position C is $(g = 10 m s^{- 2})$

Discussion

3663.	Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to
Answer» Gas at a pressure $P_{0}$ , in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

3663.

Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Answer»

Gas at a pressure $P_{0}$ , in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

Discussion

3664.	A solid cube is first floating in a liquid. The coefficient of linear expansion of the cube is α and the coefficient of volume expansion of the liquid is γ. On increasing the temperature of the (liquid + cube) system, the cube will sink if
Answer» A solid cube is first floating in a liquid. The coefficient of linear expansion of the cube is $α$ and the coefficient of volume expansion of the liquid is $γ$ . On increasing the temperature of the (liquid + cube) system, the cube will sink if

Discussion

3665.	Find the acceleration of block of mass ′4m′, assuming that the surface and pulley are smooth and the string is inextensible.
Answer» Find the acceleration of block of mass $^{'} 4 m^{'}$ , assuming that the surface and pulley are smooth and the string is inextensible.

Discussion

3666.	A hammer of weight 2 kg, moving with velocity 8 m/s, strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in 0.02 sec, the impule associated with the spike will be:
Answer» A hammer of weight $2 kg$ , moving with velocity $8 m/s$ , strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in $0.02 sec$ , the impule associated with the spike will be:

Discussion

3667.	Find the vector parallel to the vector ^i−2^j and has magnitude 2√5 units.
Answer» Find the vector parallel to the vector $^i - 2^j$ and has magnitude $2 \sqrt{5}$ units.

Discussion

3668.	A capacitor of capacitive reactance 10 Ω is connected to an AC source having voltage V=5sin(ωt+π6). What is the value of peak current?
Answer» A capacitor of capacitive reactance $10 Ω$ is connected to an AC source having voltage $V = 5 sin (ω t + \frac{π}{6}) .$ What is the value of peak current?

Discussion

3669.	A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun
Answer» A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun

Discussion

3670.	A string can withstand a tension of 25 N. What is the greatest speed at which a body of mass 1 kg can be whirled in a horizontal circle using a 1 m length of a string ?
Answer» A string can withstand a tension of $25 N$ . What is the greatest speed at which a body of mass $1 kg$ can be whirled in a horizontal circle using a $1 m$ length of a string ?

Discussion

3671.	Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine?(g=10 m/s2)
Answer» Water falls from a height of $60 m$ at the rate of $15 k g / s$ to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine? $(g = 10 m / s^{2})$

Discussion

3672.	An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency of the open pipe is:
Answer» An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency of the open pipe is:

Discussion

3673.	Find the angle of incidence (θ) of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole (P) after reflection.
Answer» Find the angle of incidence $(θ)$ of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole $(P)$ after reflection.

Discussion

3674.	An inductor of inductance L=5 H is connected to an AC source having voltage V=10 sin(10t). What is the value of peak current?
Answer» An inductor of inductance $L = 5 H$ is connected to an AC source having voltage $V = 10 sin (10 t)$ . What is the value of peak current?

Discussion

3675.	Mn and Mp represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be
Answer» $M_{n}$ and $M_{p}$ represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

Discussion

3676.	As shown in figure, all the surfaces are frictionless and the pulleys and the string are light. The magnitude of acceleration of block 2M is
Answer» As shown in figure, all the surfaces are frictionless and the pulleys and the string are light. The magnitude of acceleration of block $2 M$ is

Discussion

3677.	A man of mass 80 kg jumps from a trolley of mass 20 kg standing on a smooth surface, with an absolute velocity of 3 m/s. The recoiling speed of the trolley is
Answer» A man of mass $80 kg$ jumps from a trolley of mass $20 kg$ standing on a smooth surface, with an absolute velocity of $3 m/s$ . The recoiling speed of the trolley is

Discussion

3678.	Find the tension in the string connecting block of mass M and ring of mass m at the instant shown. Assume all surfaces to be frictionless and the ring is constrained to move along the wire only. M=25 kg; m=9 kg and g=10 m/s2
Answer» Find the tension in the string connecting block of mass $M$ and ring of mass $m$ at the instant shown. Assume all surfaces to be frictionless and the ring is constrained to move along the wire only. $M = 25 kg; m = 9 kg$ and $g = 10 {m/s}^{2}$

Discussion

3679.	The average power dissipated in a pure inductor of inductance L when an ac current is passing through it, is
Answer» The average power dissipated in a pure inductor of inductance L when an ac current is passing through it, is

Discussion

3680.	In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is
Answer» In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is

Discussion

3681.	A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.
Answer» A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.

Discussion

3682.	Current flows through uniform, square frames as shown. In which case is the magnetic field at the centre of the frame not zero ?
Answer» Current flows through uniform, square frames as shown. In which case is the magnetic field at the centre of the frame not zero ?

Discussion

3683.	If →A=6^i−15^j and →B=−3^i+11^j, the magnitude and direction of →A+→B is
Answer» If $\to A = 6^i - 15^j$ and $\to B = - 3^i + 11^j$ , the magnitude and direction of $\to A + \to B$ is

Discussion

3684.	Find the velocity of separation of the spheres 1 and 2 if the sphere 3 comes down with a velocity of 3 m/s. Assume all spheres to be identical and frictionless.
Answer» Find the velocity of separation of the spheres $1$ and $2$ if the sphere $3$ comes down with a velocity of $3 m / s$ . Assume all spheres to be identical and frictionless.

Discussion

3685.	A rope which can withstand a maximum tension of 400 N is hanging from a tree. If a monkey of mass 30 kg climbs up the rope, in which of the following cases will the rope break? Take g=10ms−2 and neglect the mass of the rope.
Answer» A rope which can withstand a maximum tension of 400 N is hanging from a tree. If a monkey of mass 30 kg climbs up the rope, in which of the following cases will the rope break? Take $g = 10 m s^{- 2}$ and neglect the mass of the rope.

Discussion

3686.	Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel. The motion of the particle as seen from the earth is
Answer» Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel. The motion of the particle as seen from the earth is

Discussion

3687.	A block placed on a horizontal surface is being pushed by a force F making an angle θ with the vertical. The coefficient of friction between block and surface is μ. The force required to slide the block with uniform velocity on the floor is
Answer» A block placed on a horizontal surface is being pushed by a force F making an angle $θ$ with the vertical. The coefficient of friction between block and surface is $μ$ . The force required to slide the block with uniform velocity on the floor is

Discussion

3688.	In Fig. the bar is uniform and weighing 500 N. How large must W be in N if T1 and T2 are to be equal ?
Answer» In Fig. the bar is uniform and weighing $500 N$ . How large must $W$ be in $N$ if $T_{1}$ and $T_{2}$ are to be equal ?

Discussion

3689.	The sphere shown in figure lies on a rough plane when a particle of mass m traveling at a speed v0 collides and sticks with it. If the line of motion of the particle is at a distance 'h' above the plane, find the value of 'h for which the sphere starts pure rolling on the plane. Assume that the mass M of the sphere is large compared to the mass of the particle so that the center of mass of the combined system is not appreciably shifted from the centre of the sphere.
Answer» The sphere shown in figure lies on a rough plane when a particle of mass m traveling at a speed $v_{0}$ collides and sticks with it. If the line of motion of the particle is at a distance 'h' above the plane, find the value of 'h for which the sphere starts pure rolling on the plane. Assume that the mass M of the sphere is large compared to the mass of the particle so that the center of mass of the combined system is not appreciably shifted from the centre of the sphere.

3689.

The sphere shown in figure lies on a rough plane when a particle of mass m traveling at a speed v0 collides and sticks with it. If the line of motion of the particle is at a distance 'h' above the plane, find the value of 'h for which the sphere starts pure rolling on the plane. Assume that the mass M of the sphere is large compared to the mass of the particle so that the center of mass of the combined system is not appreciably shifted from the centre of the sphere.

Answer»

The sphere shown in figure lies on a rough plane when a particle of mass m traveling at a speed $v_{0}$ collides and sticks with it. If the line of motion of the particle is at a distance 'h' above the plane, find the value of 'h for which the sphere starts pure rolling on the plane. Assume that the mass M of the sphere is large compared to the mass of the particle so that the center of mass of the combined system is not appreciably shifted from the centre of the sphere.

Discussion

3690.	The mass M shown in the figure oscillates in simple harmonic motion with amplitude A. The amplitude of the point P is
Answer» The mass M shown in the figure oscillates in simple harmonic motion with amplitude A. The amplitude of the point P is

Discussion

3691.	The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from t=0 to t=6 s is
Answer» The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from $t = 0$ to $t = 6 s$ is

Discussion

3692.	If the frequency of light in a photoelectric experiment is doubled, the stopping potential will
Answer» If the frequency of light in a photoelectric experiment is doubled, the stopping potential will

Discussion

3693.	Power applied to a particle varies with time as P=(3t2−2t+1) W, where t is in second. Find the change in its kinetic energy as time changes from t=2 s to t=4 s.
Answer» Power applied to a particle varies with time as $P = (3 t^{2} - 2 t + 1) W$ , where $t$ is in second. Find the change in its kinetic energy as time changes from $t = 2 s$ to $t = 4 s$ .

Discussion

3694.	Electric charge is uniformly distributed along a long straight wire of radius 1mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is
Answer» Electric charge is uniformly distributed along a long straight wire of radius 1mm. The charge per cm length of the wire is Q coulomb. Another cylindrical surface of radius 50 cm and length 1m symmetrically encloses the wire as shown in the figure. The total electric flux passing through the cylindrical surface is

Discussion

3695.	If the work function of a metal is ′ϕ′ and the frequency of the incident light is 'v', there is no emission of photoelectron if
Answer» If the work function of a metal is $^{'} ϕ^{'}$ and the frequency of the incident light is 'v', there is no emission of photoelectron if

Discussion

3696.	A particle is moving in a straight line with initial velocity u and uniform acceleration f. If the sum of the distances travelled in tth and (t+1)th seconds is 100 cm, then its velocity after t seconds (in cm/s) is
Answer» A particle is moving in a straight line with initial velocity $u$ and uniform acceleration $f$ . If the sum of the distances travelled in $t^{t h}$ and $(t + 1)^{t h}$ seconds is $100 cm$ , then its velocity after $t$ seconds (in $cm/s$ ) is

Discussion

3697.	An ant moves from A to B. Find the distance (d) and displacement ( s).
Answer» An ant moves from A to B. Find the distance (d) and displacement ( s).

3697.

An ant moves from A to B. Find the distance (d) and displacement ( s).

Answer»

An ant moves from A to B. Find the distance (d) and displacement ( s).

Discussion

3698.	If potential energy between a proton and an electron is given by U = −ke22R3, where e is the charge of electron and R is the radius of atom, then radius of Bohr's orbit is given by (h = Planck's constant, k = constant)
Answer» If potential energy between a proton and an electron is given by $U = \frac{- k e^{2}}{2 R^{3}}$ , where e is the charge of electron and R is the radius of atom, then radius of Bohr's orbit is given by ( $h$ = Planck's constant, $k$ = constant)

Discussion

3699.	When a uniform metallic wire is stretched the lateral strain produced in it is β. If ν and Y are the Poisson's ratio and Young's modulus for the wire, then elastic potential energy density of wire is
Answer» When a uniform metallic wire is stretched the lateral strain produced in it is $β$ . If $ν$ and $Y$ are the Poisson's ratio and Young's modulus for the wire, then elastic potential energy density of wire is

Discussion

3700.	In the figure shown two beads slide along a smooth horizontal rod. If V=kVo find the value of k if θ=30°.
Answer» In the figure shown two beads slide along a smooth horizontal rod. If $V = k V_{o}$ find the value of $k$ if $θ = 30 °$ .

Discussion

Explore topic-wise InterviewSolutions in .

If the velocity head of a stream of water is equal to 10 cm, then its speed of flow is approximately

If a body travels half its total path in the last second of its fall from rest, find the time of its fall. Take g=10 m/s2.

If characteristic gas constant of a given gas is one fourth of universal gas constant, the given gas could be

The height at which the acceleration due to gravity becomes g9 (where g = the acceleration due to gravity on the surface of th earth) in terms of R, radius of the earth is

Figure shows two rods p & q moving with a same velocity of 2 m/s perpendicular to their length. If angle between the rods is 106∘, velocity of point of intersection (in m/s) is.

Two particles A and B are projected simultaneously with velocities VA=11 m/s and VB=15 m/s as shown in the figure. Find the time (in seconds) when they collide.

Magnitude of resultant of 3 vectors −−→OA, −−→OB, and −−→OC as shown below is

1 mole of real gas (a=1.4) occupies a volume of 0.1 L at 300 K, then what will be the pressure of gas?

In the given figure, equivalent resistance between A and B will be

Fig. Shows the vertical section of a frictionless surface. A block of mass 2 kg is released from rest from position A; its KE as it reaches position C is (g=10ms−2)

Gas at a pressure P0, in contained is a vessel. If the masses of all the molecules are halved and their speeds are doubled, the resulting pressure P will be equal to

A solid cube is first floating in a liquid. The coefficient of linear expansion of the cube is α and the coefficient of volume expansion of the liquid is γ. On increasing the temperature of the (liquid + cube) system, the cube will sink if

Find the acceleration of block of mass ′4m′, assuming that the surface and pulley are smooth and the string is inextensible.

A hammer of weight 2 kg, moving with velocity 8 m/s, strikes against the head of a spike, and drives it into a block of wood. If hammer comes to rest in 0.02 sec, the impule associated with the spike will be:

Find the vector parallel to the vector ^i−2^j and has magnitude 2√5 units.

A capacitor of capacitive reactance 10 Ω is connected to an AC source having voltage V=5sin(ωt+π6). What is the value of peak current?

A small body starts falling on to the earth from a distance equal to the radius of the earth's orbit. How long will the body take to reach the sun? Express the time in terms of T, period of revolution of the earth round the sun

A string can withstand a tension of 25 N. What is the greatest speed at which a body of mass 1 kg can be whirled in a horizontal circle using a 1 m length of a string ?

Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional forces are 10% of energy. How much power is generated by the turbine?(g=10 m/s2)

An open pipe is suddenly closed at one end with the result that the frequency of third harmonic of the closed pipe is found to be higher by 100 Hz than the fundamental frequency of the open pipe. The fundamental frequency of the open pipe is:

Find the angle of incidence (θ) of a paraxial ray incident on a concave mirror of large aperture, for which it passes through the pole (P) after reflection.

An inductor of inductance L=5 H is connected to an AC source having voltage V=10 sin(10t). What is the value of peak current?

Mn and Mp represent mass of neutron and proton respectively. If an element having nuclear mass M has N-neutron and Z-proton, then the correct relation will be

As shown in figure, all the surfaces are frictionless and the pulleys and the string are light. The magnitude of acceleration of block 2M is

A man of mass 80 kg jumps from a trolley of mass 20 kg standing on a smooth surface, with an absolute velocity of 3 m/s. The recoiling speed of the trolley is

Find the tension in the string connecting block of mass M and ring of mass m at the instant shown. Assume all surfaces to be frictionless and the ring is constrained to move along the wire only. M=25 kg; m=9 kg and g=10 m/s2

The average power dissipated in a pure inductor of inductance L when an ac current is passing through it, is

In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is

A wheel is making revolutions about its axis with uniform angular acceleration. Starting from rest, it reaches 100 rev/sec in 4 seconds. Find the angular acceleration.

Current flows through uniform, square frames as shown. In which case is the magnetic field at the centre of the frame not zero ?

If →A=6^i−15^j and →B=−3^i+11^j, the magnitude and direction of →A+→B is

Find the velocity of separation of the spheres 1 and 2 if the sphere 3 comes down with a velocity of 3 m/s. Assume all spheres to be identical and frictionless.

A rope which can withstand a maximum tension of 400 N is hanging from a tree. If a monkey of mass 30 kg climbs up the rope, in which of the following cases will the rope break? Take g=10ms−2 and neglect the mass of the rope.

Suppose a tunnel is dug along a diameter of the earth. A particle is dropped from a point, a distance h directly above the tunnel. The motion of the particle as seen from the earth is

A block placed on a horizontal surface is being pushed by a force F making an angle θ with the vertical. The coefficient of friction between block and surface is μ. The force required to slide the block with uniform velocity on the floor is

In Fig. the bar is uniform and weighing 500 N. How large must W be in N if T1 and T2 are to be equal ?

The mass M shown in the figure oscillates in simple harmonic motion with amplitude A. The amplitude of the point P is

The acceleration-time graph for a particle moving in a straight line is as shown in the figure. Change in the velocity of the particle from t=0 to t=6 s is

If the frequency of light in a photoelectric experiment is doubled, the stopping potential will

Power applied to a particle varies with time as P=(3t2−2t+1) W, where t is in second. Find the change in its kinetic energy as time changes from t=2 s to t=4 s.

If the work function of a metal is ′ϕ′ and the frequency of the incident light is 'v', there is no emission of photoelectron if

A particle is moving in a straight line with initial velocity u and uniform acceleration f. If the sum of the distances travelled in tth and (t+1)th seconds is 100 cm, then its velocity after t seconds (in cm/s) is

An ant moves from A to B. Find the distance (d) and displacement ( s).

If potential energy between a proton and an electron is given by U = −ke22R3, where e is the charge of electron and R is the radius of atom, then radius of Bohr's orbit is given by (h = Planck's constant, k = constant)

When a uniform metallic wire is stretched the lateral strain produced in it is β. If ν and Y are the Poisson's ratio and Young's modulus for the wire, then elastic potential energy density of wire is

In the figure shown two beads slide along a smooth horizontal rod. If V=kVo find the value of k if θ=30°.