50278 + Interview Questions in Physics

1.	In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]
Answer» In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]

1.

In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]

Answer»

In S.H.M. maximum acceleration is at

[RPET 2001; BVP 2003]

2.	A body moves due East with velocity 20 km/hour and then due North with velocity 15 km/hour. The resultant velocity
Answer» A body moves due East with velocity 20 km/hour and then due North with velocity 15 km/hour. The resultant velocity

Discussion

3.	A stone is thrown at an angle θ to the horizontal reaches a maximum height H. Then the time of flight of stone will be
Answer» A stone is thrown at an angle $θ$ to the horizontal reaches a maximum height H. Then the time of flight of stone will be

Discussion

4.	A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 π t + π2) cos (10 πx) where x and y are in metre and t in second
Answer» A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 $π$ t + $\frac{π}{2}$ ) cos (10 $π$ x) where x and y are in metre and t in second

Discussion

5.	A particle of mass one microgram is confined to move along one direction (x- axis) within a region 1 mm in extension. What is the uncertainity in its velocity?
Answer» A particle of mass one microgram is confined to move along one direction (x- axis) within a region 1 mm in extension. What is the uncertainity in its velocity?

Discussion

6.	An aeroplane flying 490 m above ground level at 100 m/s, releases a block. What horizontal distance would it travel before it hits the ground?
Answer» An aeroplane flying 490 m above ground level at 100 m/s, releases a block. What horizontal distance would it travel before it hits the ground?

Discussion

7.	For the process 2 F (g) → F2(g) the sign of ΔH and ΔS respectively are
Answer» For the process $2 F (g) \to F_{2} (g)$ the sign of $Δ H$ and $Δ S$ respectively are

Discussion

8.	A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at 27∘C it weighs 30 gm. When the temperature of liquid is raised to 42∘C the metal piece weight 30.5 gm, specific gravity of the liquid at 42∘C is 1.20, then the linear expansion of the metal will be
Answer» A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at $27^{\circ} C$ it weighs 30 gm. When the temperature of liquid is raised to $42^{\circ} C$ the metal piece weight 30.5 gm, specific gravity of the liquid at $42^{\circ} C$ is 1.20, then the linear expansion of the metal will be

8.

A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at 27∘C it weighs 30 gm. When the temperature of liquid is raised to 42∘C the metal piece weight 30.5 gm, specific gravity of the liquid at 42∘C is 1.20, then the linear expansion of the metal will be

Answer»

A piece of metal weight 46 gm in air, when it is immersed in the liquid of specific gravity 1.24 at $27^{\circ} C$ it weighs 30 gm. When the temperature of liquid is raised to $42^{\circ} C$ the metal piece weight 30.5 gm, specific gravity of the liquid at $42^{\circ} C$ is 1.20, then the linear expansion of the metal will be

Discussion

9.	A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three second of its motion. The stone remains in the air for
Answer» A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three second of its motion. The stone remains in the air for

Discussion

10.	For a perfectly black body, its absorptive power is
Answer» For a perfectly black body, its absorptive power is

Discussion

11.	When a monoatomic gas expands at a constant pressure, what percentage of heat supplied is used to increase the internal energy of the gas?
Answer» When a monoatomic gas expands at a constant pressure, what percentage of heat supplied is used to increase the internal energy of the gas?

Discussion

12.	Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 s. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the wave.
Answer» Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 s. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the wave.

Discussion

13.	Two identical satellites are at 7R and R away from earth surface, the wrong statement is (R = Radius of earth)
Answer» Two identical satellites are at 7R and R away from earth surface, the wrong statement is (R = Radius of earth)

Discussion

14.	A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and ∘C. At the same pressure but at 273∘C, its volume will be
Answer» A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and $^{\circ} C$ . At the same pressure but at $273^{\circ}$ C, its volume will be

Discussion

15.	A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then
Answer» A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

15.

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

Answer»

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

Discussion

16.	A rectangular lamina of mass 2 kg is having side a=6 m and b=3 m. What is the moment of inertia of the rectangular lamina about an axis passing through the side 3 m as shown in figure below?
Answer» A rectangular lamina of mass $2 kg$ is having side $a = 6 m$ and $b = 3 m$ . What is the moment of inertia of the rectangular lamina about an axis passing through the side $3 m$ as shown in figure below?

Discussion

17.	A particle moves according to the equation x=t2+3t+4 . The average velocity in the first 5 s is
Answer» A particle moves according to the equation $x = t^{2} + 3 t + 4$ . The average velocity in the first $5 s$ is

Discussion

18.	Four particles each of mass m are kept at the four corners of a square of edge a. Find the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square
Answer» Four particles each of mass $m$ are kept at the four corners of a square of edge $a$ . Find the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square

Discussion

19.	Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires
Answer» Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires

Discussion

20.	Two point masses m and 2m are initially kept at distance 3X0. Now they are released and move only under their mutual gravitational interaction force. They collide after time t0. Average speed of particle of mass 2m during this time is √αGm9π2X0. Find value of α, where α is a constant.
Answer» Two point masses $m$ and $2 m$ are initially kept at distance $3 X_{0}$ . Now they are released and move only under their mutual gravitational interaction force. They collide after time $t_{0}$ . Average speed of particle of mass $2 m$ during this time is $\sqrt{\frac{α G m}{9 π^{2} X_{0}}}$ . Find value of $α$ , where $α$ is a constant.

Discussion

21.	Half of the rectangular plate shown in figure is made of a material of density p1 and the other half of density p2. The length of the plate is L. Locate the centre of mass of the plate.
Answer» Half of the rectangular plate shown in figure is made of a material of density $p_{1}$ and the other half of density $p_{2}$ . The length of the plate is $L$ . Locate the centre of mass of the plate.

Discussion

22.	Two objects are thrown up at angles of 45∘ and 60∘ respectively, with the horizontal. If both objects attain same vertical height, then the ratio of magnitude of velocities with which they are projected is
Answer» Two objects are thrown up at angles of $45^{\circ}$ and $60^{\circ}$ respectively, with the horizontal. If both objects attain same vertical height, then the ratio of magnitude of velocities with which they are projected is

Discussion

23.	A transverse wave travels along the Z-axis,the particles of the medium must move
Answer» A transverse wave travels along the Z-axis,the particles of the medium must move

Discussion

24.	A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be
Answer» A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be

Discussion

25.	The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is
Answer» The potential differences across the resistance, capacitance and inductance are $80 V, 40 V$ and $100 V$ respectively in an L-C-R circuit. The power factor of this circuit is

Discussion

26.	A car is going at a speed of 6 m/s when it encounters a 15 m slope of angle 30∘. The friction coefficient between the road and tyre is 0.5. The minimum speed of car with which it can reach the bottom is (g=10 m/s2)
Answer» A car is going at a speed of $6 m/s$ when it encounters a $15 m$ slope of angle $30^{\circ}$ . The friction coefficient between the road and tyre is $0.5$ . The minimum speed of car with which it can reach the bottom is $(g = 10 {m/s}^{2})$

Discussion

27.	Difference between plane angle and solid angle
Answer» Difference between plane angle and solid angle

Discussion

28.	A cord is wound round the circumference of wheel of radius 'r'. The axis of the wheel is horizontal and moment of inertia about it is 'I'. A weight 'mg' is attached to the end of the cord and falls from rest. After falling through a distance h, the angular velocity of the wheel will be
Answer» A cord is wound round the circumference of wheel of radius 'r'. The axis of the wheel is horizontal and moment of inertia about it is 'I'. A weight 'mg' is attached to the end of the cord and falls from rest. After falling through a distance h, the angular velocity of the wheel will be

Discussion

29.	A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?
Answer» A hoop of radius r and mass m rotating with an angular velocity $ω_{0}$ is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

Discussion

30.	Ten tuning fork are arrange in increasing order of frequency in such a way that any two nearest tuning fork produce 4beats per second. The highest frequency is twice that of the lowest .possible highest and lowest frequency are
Answer» Ten tuning fork are arrange in increasing order of frequency in such a way that any two nearest tuning fork produce 4beats per second. The highest frequency is twice that of the lowest .possible highest and lowest frequency are

Discussion

31.	An automobile moves on a rough road with a speed of 54 kmh−1. The radius of its wheels is 0.45 m and the moment of inertia of the wheel about its axis of rotation is 3 kg.m2. If the wheel is brought to rest in 15 s, then find magnitude of average torque transmitted by the brakes to wheel. Assume no slipping at all points of contact.
Answer» An automobile moves on a rough road with a speed of $54 {kmh}^{- 1}$ . The radius of its wheels is $0.45 m$ and the moment of inertia of the wheel about its axis of rotation is $3 {kg.m}^{2}$ . If the wheel is brought to rest in $15 s$ , then find magnitude of average torque transmitted by the brakes to wheel. Assume no slipping at all points of contact.

Discussion

32.	A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth
Answer» A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth

Discussion

33.	A particle is projected at 60∘ to the horizontal with a kinetic energy K. The kinetic energy at the highest point is:
Answer» A particle is projected at $60^{\circ}$ to the horizontal with a kinetic energy K. The kinetic energy at the highest point is:

Discussion

34.	Evaluate ∫101√1+x+√xdx
Answer» Evaluate $\int_{0}^{1} \frac{1}{\sqrt{1 + x} + \sqrt{x}} d x$

Discussion

35.	A wire is attached to a pan of mass 100 g that contains a 1 kg mass as shown in figure. When the wire is plucked, the wire vibrates at a fundamental frequency of 110 Hz. An additional mass M is then added to the pan and a fundamental frequency of 130 Hz is detected. What is the mass M?
Answer» A wire is attached to a pan of mass $100 g$ that contains a $1 kg$ mass as shown in figure. When the wire is plucked, the wire vibrates at a fundamental frequency of $110 Hz$ . An additional mass $M$ is then added to the pan and a fundamental frequency of $130 Hz$ is detected. What is the mass $M$ ?

Discussion

36.	Two small balls A and B, each of mass 'm', are attached rigidly to the ends of a light rod of length 'd'. The structure rotates about the perpendicular bisector of the rod at an angular speed ω. Calculate the angular momentum of the individual balls and of the system about the axis of rotation.
Answer» Two small balls A and B, each of mass 'm', are attached rigidly to the ends of a light rod of length 'd'. The structure rotates about the perpendicular bisector of the rod at an angular speed $ω$ . Calculate the angular momentum of the individual balls and of the system about the axis of rotation.

Discussion

37.	A concave mirror of radius R is kept on a horizontal table. Water (refractive index =μ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself ?
Answer» A concave mirror of radius R is kept on a horizontal table. Water (refractive index $= μ$ ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself ?

37.

A concave mirror of radius R is kept on a horizontal table. Water (refractive index =μ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself ?

Answer»

A concave mirror of radius R is kept on a horizontal table. Water (refractive index $= μ$ ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself ?

Discussion

38.	A rigid body of mass 'M' and radius R is rolling without sliding, along with bock of radius of gyration K, and mass m1, then find the minimum value of friction coefficient μ?
Answer» A rigid body of mass 'M' and radius R is rolling without sliding, along with bock of radius of gyration K, and mass $m_{1}$ , then find the minimum value of friction coefficient $μ$ ?

38.

A rigid body of mass 'M' and radius R is rolling without sliding, along with bock of radius of gyration K, and mass m1, then find the minimum value of friction coefficient μ?

Answer»

A rigid body of mass 'M' and radius R is rolling without sliding, along with bock of radius of gyration K, and mass $m_{1}$ , then find the minimum value of friction coefficient $μ$ ?

Discussion

39.	Why nuclei of a molecule also have spins like electron?
Answer» Why nuclei of a molecule also have spins like electron?

Discussion

40.	An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness, what would be the peak voltage of the source ?
Answer» An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness, what would be the peak voltage of the source ?

Discussion

41.	A vessel at rest explodes into three pieces. Two pieces having equal masses fly off perpendicular to one another with the same velocity of 30 m/s. The third piece has three times mass of each of the other piece. The magnitude and direction of the velocity of the third piece would be
Answer» A vessel at rest explodes into three pieces. Two pieces having equal masses fly off perpendicular to one another with the same velocity of 30 m/s. The third piece has three times mass of each of the other piece. The magnitude and direction of the velocity of the third piece would be

Discussion

42.	A linear simple harmonic oscillation has a total mechanical energy of 300 J. Its potential energy at mean position is 100 J. Find the minimum potential energy.
Answer» A linear simple harmonic oscillation has a total mechanical energy of $300 J$ . Its potential energy at mean position is $100 J$ . Find the minimum potential energy.

Discussion

43.	Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V. The mass of the gas in A is mA and that in B is mB. The gas in each cylinder is now allowed to expand isothermally to the same final volume 2V. The changes in the pressure in A and B are found to be △P and 1.5 △P respectively. Then
Answer» Two identical containers A and B with frictionless pistons contain the same ideal gas at the same temperature and the same volume V. The mass of the gas in A is $m_{A}$ and that in B is $m_{B}$ . The gas in each cylinder is now allowed to expand isothermally to the same final volume 2V. The changes in the pressure in A and B are found to be $△ P$ and 1.5 $△ P$ respectively. Then

Discussion

44.	In Figure shows a uniform rod of length 30 cm having a mass of 3.0 kg. The strings shown in the figure are pulled by constant forces of 20 N and 32 N. Find the force exerted by the 20 cm part of the rod on the 10 cm part. All the surfaces are smooth and the strings and the pulleys are light.
Answer» In Figure shows a uniform rod of length 30 cm having a mass of 3.0 kg. The strings shown in the figure are pulled by constant forces of 20 N and 32 N. Find the force exerted by the 20 cm part of the rod on the 10 cm part. All the surfaces are smooth and the strings and the pulleys are light.

44.

In Figure shows a uniform rod of length 30 cm having a mass of 3.0 kg. The strings shown in the figure are pulled by constant forces of 20 N and 32 N. Find the force exerted by the 20 cm part of the rod on the 10 cm part. All the surfaces are smooth and the strings and the pulleys are light.

Answer»

In Figure shows a uniform rod of length 30 cm having a mass of 3.0 kg. The strings shown in the figure are pulled by constant forces of 20 N and 32 N. Find the force exerted by the 20 cm part of the rod on the 10 cm part. All the surfaces are smooth and the strings and the pulleys are light.

Discussion

45.	In the addition shown, each of the letters T, H, I, S represents a non zero digit. What is T+H+I+S?
Answer» In the addition shown, each of the letters $T, H, I, S$ represents a non zero digit. What is $T+H+I+S$ ?

Discussion

46.	The magnitudes of vectors →A,→Band→C are 3, 4 and 5 units respectively. If →A+→B=→C, the angle between →A and →B is
Answer» The magnitudes of vectors $\to A, \to B a n d \to C$ are 3, 4 and 5 units respectively. If $\to A + \to B = \to C$ , the angle between $\to A$ and $\to B$ is

Discussion

47.	Two circular coils X and Y, having equal number of turns and carrying equal currents in the same sense, subtend same solid angle at point O. If the smaller coil X is midway between O and Y and if we represent the magnetic field due to bigger coil Y at O as By and that due to smaller coil X at O as Bx, then
Answer» Two circular coils $X$ and $Y$ , having equal number of turns and carrying equal currents in the same sense, subtend same solid angle at point $O$ . If the smaller coil $X$ is midway between $O$ and $Y$ and if we represent the magnetic field due to bigger coil $Y$ at $O$ as $B_{y}$ and that due to smaller coil $X$ at $O$ as $B_{x}$ , then

Discussion

48.	Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be
Answer» Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are $k_{1} a n d k_{2}$ respectively. The thermal conductivity of the composite slab will be

48.

Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be

Answer»

Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are $k_{1} a n d k_{2}$ respectively. The thermal conductivity of the composite slab will be

Discussion

49.	A ball of mass 2 kg having charge 1 μC is dropped from the top of a high tower. In the space, an electric field exist in horizontal direction away from the tower which varies as E=(5−2x)×106 V/m (where x is horizontal distance from tower), the maximum horizontal distance (in m) ball can go from the tower is
Answer» A ball of mass $2 k g$ having charge $1 μ C$ is dropped from the top of a high tower. In the space, an electric field exist in horizontal direction away from the tower which varies as $E = (5 - 2 x) \times 10^{6} V / m$ (where $x$ is horizontal distance from tower), the maximum horizontal distance (in $m$ ) ball can go from the tower is

Discussion

50.	An electron moving in a circular orbit of radius r makes n rotations per second.The magnetic field produced at the centre has magnitude:
Answer» An electron moving in a circular orbit of radius r makes n rotations per second.The magnetic field produced at the centre has magnitude:

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

In S.H.M. maximum acceleration is at [RPET 2001; BVP 2003]

A body moves due East with velocity 20 km/hour and then due North with velocity 15 km/hour. The resultant velocity

A stone is thrown at an angle θ to the horizontal reaches a maximum height H. Then the time of flight of stone will be

A wave disturbance in a medium is described by y(x , t)= 0.02 cos (50 π t + π2) cos (10 πx) where x and y are in metre and t in second

A particle of mass one microgram is confined to move along one direction (x- axis) within a region 1 mm in extension. What is the uncertainity in its velocity?

An aeroplane flying 490 m above ground level at 100 m/s, releases a block. What horizontal distance would it travel before it hits the ground?

For the process 2 F (g) → F2(g) the sign of ΔH and ΔS respectively are

A stone falls freely from rest and the total distance covered by it in the last second of its motion equals the distance covered by it in the first three second of its motion. The stone remains in the air for

For a perfectly black body, its absorptive power is

When a monoatomic gas expands at a constant pressure, what percentage of heat supplied is used to increase the internal energy of the gas?

Two canoes are 10 m apart on a lake. Each bobs up and down with a period of 4.0 s. When one canoe is at its highest point, the other canoe is at its lowest point. Both canoes are always within a single cycle of the waves. Determine the speed of the wave.

Two identical satellites are at 7R and R away from earth surface, the wrong statement is (R = Radius of earth)

A certain sample of gas has a volume of 0.2 litre measured at 1 atm pressure and ∘C. At the same pressure but at 273∘C, its volume will be

A lorry and a car moving with the same K.E. are brought to rest by applying the same retarding force, then

A rectangular lamina of mass 2 kg is having side a=6 m and b=3 m. What is the moment of inertia of the rectangular lamina about an axis passing through the side 3 m as shown in figure below?

A particle moves according to the equation x=t2+3t+4 . The average velocity in the first 5 s is

Four particles each of mass m are kept at the four corners of a square of edge a. Find the moment of inertia of the system about the line perpendicular to the plane of the square and passing through the centre of the square

Two long wires are hanging freely. They are joined first in parallel and then in series and then are connected with a battery. In both cases, which type of force acts between the two wires

Two point masses m and 2m are initially kept at distance 3X0. Now they are released and move only under their mutual gravitational interaction force. They collide after time t0. Average speed of particle of mass 2m during this time is √αGm9π2X0. Find value of α, where α is a constant.

Half of the rectangular plate shown in figure is made of a material of density p1 and the other half of density p2. The length of the plate is L. Locate the centre of mass of the plate.

Two objects are thrown up at angles of 45∘ and 60∘ respectively, with the horizontal. If both objects attain same vertical height, then the ratio of magnitude of velocities with which they are projected is

A transverse wave travels along the Z-axis,the particles of the medium must move

A body is dropped from a height equal to the radius of the Earth, M is the mass of the Earth. R is the radius of the Earth. The velocity of the body on reaching the surface of Earth will be

The potential differences across the resistance, capacitance and inductance are 80 V, 40 V and 100 V respectively in an L-C-R circuit. The power factor of this circuit is

A car is going at a speed of 6 m/s when it encounters a 15 m slope of angle 30∘. The friction coefficient between the road and tyre is 0.5. The minimum speed of car with which it can reach the bottom is (g=10 m/s2)

Difference between plane angle and solid angle

A cord is wound round the circumference of wheel of radius 'r'. The axis of the wheel is horizontal and moment of inertia about it is 'I'. A weight 'mg' is attached to the end of the cord and falls from rest. After falling through a distance h, the angular velocity of the wheel will be

A hoop of radius r and mass m rotating with an angular velocity ω0 is placed on a rough horizontal surface. The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

Ten tuning fork are arrange in increasing order of frequency in such a way that any two nearest tuning fork produce 4beats per second. The highest frequency is twice that of the lowest .possible highest and lowest frequency are

A satellite S is moving in an elliptical orbit around the earth. The mass of the satellite is very small compared to the mass of the earth

A particle is projected at 60∘ to the horizontal with a kinetic energy K. The kinetic energy at the highest point is:

Evaluate ∫101√1+x+√xdx

A wire is attached to a pan of mass 100 g that contains a 1 kg mass as shown in figure. When the wire is plucked, the wire vibrates at a fundamental frequency of 110 Hz. An additional mass M is then added to the pan and a fundamental frequency of 130 Hz is detected. What is the mass M?

Two small balls A and B, each of mass 'm', are attached rigidly to the ends of a light rod of length 'd'. The structure rotates about the perpendicular bisector of the rod at an angular speed ω. Calculate the angular momentum of the individual balls and of the system about the axis of rotation.

A concave mirror of radius R is kept on a horizontal table. Water (refractive index =μ) is poured into it up to a height h. Where should an object be placed so that its image is formed on itself ?

A rigid body of mass 'M' and radius R is rolling without sliding, along with bock of radius of gyration K, and mass m1, then find the minimum value of friction coefficient μ?

Why nuclei of a molecule also have spins like electron?

An electric bulb is designed to operate at 12 volts DC. If this bulb is connected to an AC source and gives normal brightness, what would be the peak voltage of the source ?

A vessel at rest explodes into three pieces. Two pieces having equal masses fly off perpendicular to one another with the same velocity of 30 m/s. The third piece has three times mass of each of the other piece. The magnitude and direction of the velocity of the third piece would be

A linear simple harmonic oscillation has a total mechanical energy of 300 J. Its potential energy at mean position is 100 J. Find the minimum potential energy.

In Figure shows a uniform rod of length 30 cm having a mass of 3.0 kg. The strings shown in the figure are pulled by constant forces of 20 N and 32 N. Find the force exerted by the 20 cm part of the rod on the 10 cm part. All the surfaces are smooth and the strings and the pulleys are light.

In the addition shown, each of the letters T, H, I, S represents a non zero digit. What is T+H+I+S?

The magnitudes of vectors →A,→Band→C are 3, 4 and 5 units respectively. If →A+→B=→C, the angle between →A and →B is

Two slabs A and B of different materials but of the same thickness are joined as shown in figure. The thermal conductivities of A and B are k1 and k2 respectively. The thermal conductivity of the composite slab will be

An electron moving in a circular orbit of radius r makes n rotations per second.The magnetic field produced at the centre has magnitude: