50278 + Interview Questions in Physics

1.	Two electric bulbs whose resistances are in the ratio of 1:2 are connected in series. The powers dissipated in them have the ratio -
Answer» Two electric bulbs whose resistances are in the ratio of $1 : 2$ are connected in series. The powers dissipated in them have the ratio -

Discussion

2.	if rate of reaction is incresed to two times with every 10 degree rise in temprature then if we raise the temprature by 40 degree new rate will be
Answer» if rate of reaction is incresed to two times with every 10 degree rise in temprature then if we raise the temprature by 40 degree new rate will be

Discussion

3.	A circular coil of 16 turns and radius 10 cm carrying a current of 0.75 A rests with its plane normal to an external field of magnitude5.0 × 10–2 T. The coil is free to turn about an axis in its planeperpendicular to the field direction. When the coil is turned slightlyand released, it oscillates about its stable equilibrium with afrequency of 2.0 s–1. What is the moment of inertia of the coil aboutits axis of rotation?
Answer» A circular coil of 16 turns and radius 10 cm carrying a current of 0.75 A rests with its plane normal to an external field of magnitude5.0 × 10–2 T. The coil is free to turn about an axis in its planeperpendicular to the field direction. When the coil is turned slightlyand released, it oscillates about its stable equilibrium with afrequency of 2.0 s–1. What is the moment of inertia of the coil aboutits axis of rotation?

Discussion

4.	Find the Electric Field inside a Hollow Negatively charged uniform Sphere(radius R) at a distance X from the centre?(where x is ;0
Answer» Find the Electric Field inside a Hollow Negatively charged uniform Sphere(radius R) at a distance X from the centre?(where x is ;0

Discussion

5.	in He–Ne laser, metastable state exist in (1)He (2)Ne (3)both 1 and 2 (4) non
Answer» in He–Ne laser, metastable state exist in (1)He (2)Ne (3)both 1 and 2 (4) non

Discussion

6.	The ratio of escape velocities of two planets, if g value on the two planets are 9.9 m/s2 and 3.3 m/s2 and their radii are 6400 km and 3200 km respectively is
Answer» The ratio of escape velocities of two planets, if $g$ value on the two planets are $9.9 {m/s}^{2}$ and $3.3 {m/s}^{2}$ and their radii are $6400 km$ and $3200 km$ respectively is

Discussion

7.	A cube of wood supporting 200 g mass just floats in water. When mass is removed cube rises by 2 cm. What is side of cube in cm? (Density of water = 1000 kgm3)
Answer» A cube of wood supporting $200 g$ mass just floats in water. When mass is removed cube rises by $2 c m$ . What is side of cube in $c m$ ? (Density of water = 1000 $\frac{k g}{m^{3}}$ )

Discussion

8.	The length of a conical pendulum is l=2 m and its bob has a mass of m=0.2 kg. The string will break if the tension T exceeds 4 N and g=10 m/s2. Then the smallest angle the string can make with the horizontal is
Answer» The length of a conical pendulum is $l = 2 m$ and its bob has a mass of $m = 0.2 kg$ . The string will break if the tension $T$ exceeds $4 N$ and $g = 10 {m/s}^{2}$ . Then the smallest angle the string can make with the horizontal is

Discussion

9.	The range of a particle when thrown at angle of 15∘ with the horizontal is 1.5 km. What maximum range can the particle achieve if speed of projection is kept constant?
Answer» The range of a particle when thrown at angle of $15^{\circ}$ with the horizontal is 1.5 km. What maximum range can the particle achieve if speed of projection is kept constant?

Discussion

10.	What is mean by enthalpy and entropy
Answer» What is mean by enthalpy and entropy

Discussion

11.	A force →F=2xy2^i+2x2y^j acts on a particle. The particle starts from point (1,2) and moves to the point (3,4). The total work done by the force →F on the particle is
Answer» A force $\to F = 2 x y^{2}^i + 2 x^{2} y^j$ acts on a particle. The particle starts from point $(1, 2)$ and moves to the point $(3, 4)$ . The total work done by the force $\to F$ on the particle is

Discussion

12.	The radius of the central bright spot in the diffraction pattern of a circular hole of diameter d with light of wavelength λ is r and the distance between the circular hole and screen is D, Now, the whole set up is immersed in a liquid of refractive index μ and the distance between the hole and the screen is reduced by 2 times, the radius of central bright spot reduced by 4 times. The value of μ is
Answer» The radius of the central bright spot in the diffraction pattern of a circular hole of diameter $d$ with light of wavelength $λ$ is $r$ and the distance between the circular hole and screen is $D$ , Now, the whole set up is immersed in a liquid of refractive index $μ$ and the distance between the hole and the screen is reduced by $2$ times, the radius of central bright spot reduced by $4$ times. The value of $μ$ is

Discussion

13.	An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is
Answer» An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is

Discussion

14.	When air is replaced by a dielectric medium of constant k , the maximum force of attraction between two charges separated by a distance
Answer» When air is replaced by a dielectric medium of constant k , the maximum force of attraction between two charges separated by a distance

Discussion

15.	two particles P and Q having magnitude of position 4 units and 5 units respectively are inclined at angle of 2/3 The magnitude of position of particle P with respect to particle Q is
Answer» two particles P and Q having magnitude of position 4 units and 5 units respectively are inclined at angle of 2/3 The magnitude of position of particle P with respect to particle Q is

Discussion

16.	Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed 20 cm from the mirror. When the air between the glass pieces is replaced by water (μw=4/3), then the image formed from the mirror is at a distance of [Assume, glass pieces have same refractive index as water]
Answer» Two thin similar convex glass pieces are joined together front to front with its rear portion silvered such that a sharp image is formed $20 cm$ from the mirror. When the air between the glass pieces is replaced by water $(μ_{w} = 4 / 3)$ , then the image formed from the mirror is at a distance of [Assume, glass pieces have same refractive index as water]

Discussion

17.	The air density at Mount Everest is less than that at the sea level. Mountaineers find that for one trip lasting a few hours, the extra oxygen needed by them corresponds to 30,000 cc at sea level (pressure 1 atmosphere, temperature 27∘C). Assuming that the temperature around Mount Everest is –73∘C and that the oxygen cylinder has a capacity of 5.2 litre, the pressure at which O2 be filled (at site) in the cylinder is
Answer» The air density at Mount Everest is less than that at the sea level. Mountaineers find that for one trip lasting a few hours, the extra oxygen needed by them corresponds to $30, 000 cc$ at sea level (pressure 1 atmosphere, temperature $27^{\circ} C$ ). Assuming that the temperature around Mount Everest is $- 73^{\circ} C$ and that the oxygen cylinder has a capacity of $5.2 litre$ , the pressure at which $O_{2}$ be filled (at site) in the cylinder is

Discussion

18.	A boy wants to jump from building A to building B. Height of building A is 25 m and that of building B is 5 m. Distance between buildings is 4 m. Assume that the boy jumps horizontally, then calculate minimum velocity with which he has to jump to land safely on building B. (1) 6 m/s (2) 8 m/s (3) 4 m/s (4) 2 m/s
Answer» A boy wants to jump from building A to building B. Height of building A is 25 m and that of building B is 5 m. Distance between buildings is 4 m. Assume that the boy jumps horizontally, then calculate minimum velocity with which he has to jump to land safely on building B. (1) 6 m/s (2) 8 m/s (3) 4 m/s (4) 2 m/s

Discussion

19.	30. Two slits are separated by 0.32 mm. A beam of 500 nm light strikes the slits producing an interference pattern. Determine the number of maxima observed in the angular range of -30^°
Answer» 30. Two slits are separated by 0.32 mm. A beam of 500 nm light strikes the slits producing an interference pattern. Determine the number of maxima observed in the angular range of -30^°

Discussion

20.	The FBD of the frame and the person for the figure shown is
Answer» The $F B D$ of the frame and the person for the figure shown is

Discussion

21.	A steel rod of 10 mm diameter is loaded with a force of 20 kN. Change in diameter of the rod is 3.82×10−3 mm . Given, Young's modulus for steel is 200 GPa, find its Poisson's ratio.
Answer» A steel rod of $10 mm$ diameter is loaded with a force of $20 kN$ . Change in diameter of the rod is $3.82 \times 10^{- 3} mm$ . Given, Young's modulus for steel is $200 GPa$ , find its Poisson's ratio.

Discussion

22.	If the attraction force between two bodies separated by R is F, then find the force between them at distance (R+d).
Answer» If the attraction force between two bodies separated by R is F, then find the force between them at distance (R+d).

Discussion

23.	If ∫dx(x2−1)√x=p⋅ln∣∣∣f(x)−1f(x)+1∣∣∣+q⋅tan−1(g(x))+C.Then the value of f(4)p−q⋅g(1)=(Where p,q are fixed constants and C is integration constant)
Answer» If $\int \frac{d x}{(x^{2} - 1) \sqrt{x}} = p \cdot ln ∣ ∣ ∣ \frac{f (x) - 1}{f (x) + 1} ∣ ∣ ∣ + q \cdot {tan}^{- 1} (g (x)) + C .$ Then the value of $\frac{f (4)}{p} - q \cdot g (1) =$ (Where $p, q$ are fixed constants and $C$ is integration constant)

Discussion

24.	A block of weight W is kept on an inclined surface whose angle of inclination is θ with horizontal. The component of weight along the incline is
Answer» A block of weight $W$ is kept on an inclined surface whose angle of inclination is $θ$ with horizontal. The component of weight along the incline is

Discussion

25.	Obtain the angular momentum of a particle moving with uniform velocity about any point outside its trajectory.
Answer» Obtain the angular momentum of a particle moving with uniform velocity about any point outside its trajectory.

Discussion

26.	34. A uniform circular ring of mass 3 kg and radius 20 cm is rotating about an axis passing through its diameter with an angular speed of 200 rpm with the help of a motor. When the motor is switched off, calculate the torque that must be applied to the ring to bring it to rest in 20 revolutions.
Answer» 34. A uniform circular ring of mass 3 kg and radius 20 cm is rotating about an axis passing through its diameter with an angular speed of 200 rpm with the help of a motor. When the motor is switched off, calculate the torque that must be applied to the ring to bring it to rest in 20 revolutions.

Discussion

27.	the velocity v of a particle moving along x axis varies with its position as v=asquare root x where a is a cons†an t which of the following graph represent the variation of its acceleration a with time i
Answer» the velocity v of a particle moving along x axis varies with its position as v=asquare root x where a is a cons†an t which of the following graph represent the variation of its acceleration a with time i

Discussion

28.	The Poisson's ratio is defined as
Answer» The Poisson's ratio is defined as

Discussion

29.	An uniform cable of mass M and length L is placed on a horizontal surface such that its (Ln) th part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be
Answer» An uniform cable of mass $M$ and length $L$ is placed on a horizontal surface such that its $(\frac{L}{n})$ th part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be

Discussion

30.	How Rydberg constant value :109677 cm Change to -2.1810 power eighteen
Answer» How Rydberg constant value :109677 cm Change to -2.1810 power eighteen

Discussion

31.	A thin equiconvex glass lens of refractive index 1.5has power of 5D. When the lens is immersed in aliquid of refractive index u, it acts as a divergentlens of focal length 100 cm. The value ofliquid isof(1) 4/3(2) 3/4(3) 5/3(4) 8/3ter 8 P Rod
Answer» A thin equiconvex glass lens of refractive index 1.5 has power of 5D. When the lens is immersed in a liquid of refractive index u, it acts as a divergent lens of focal length 100 cm. The value of liquid is of (1) 4/3 (2) 3/4 (3) 5/3 (4) 8/3 ter 8 P Rod

Discussion

32.	Isotopes are atoms having
Answer» Isotopes are atoms having

Discussion

33.	Weight of a body decreases by 1.5% when it is raised to a height h above the surface of earth. When the same body is taken to same depth h in a mine, its weight will show.
Answer» Weight of a body decreases by 1.5% when it is raised to a height h above the surface of earth. When the same body is taken to same depth h in a mine, its weight will show.

Discussion

34.	In the figure shown, a string is wound over a cylinder A. The other end of the string is attached to block B through a pulley. When the system is released the cylinder rolls down without slipping. The ratio of magnitude of vertical component of displacement of A and B in any time interval t is
Answer» In the figure shown, a string is wound over a cylinder A. The other end of the string is attached to block B through a pulley. When the system is released the cylinder rolls down without slipping. The ratio of magnitude of vertical component of displacement of A and B in any time interval t is

Discussion

35.	The current flowing through the Zener diode in the figure is
Answer» The current flowing through the Zener diode in the figure is

Discussion

36.	Choose the correct relation regarding potential of an electric dipole. Here A, B, C and D all are at equal distance from point O which is much larger than the dimensions of the dipole. Then
Answer» Choose the correct relation regarding potential of an electric dipole. Here A, B, C and D all are at equal distance from point O which is much larger than the dimensions of the dipole. Then

36.

Choose the correct relation regarding potential of an electric dipole. Here A, B, C and D all are at equal distance from point O which is much larger than the dimensions of the dipole. Then

Answer»

Choose the correct relation regarding potential of an electric dipole. Here A, B, C and D all are at equal distance from point O which is much larger than the dimensions of the dipole. Then

Discussion

37.	In the figure below, masses mA=2 kg and mB=4 kg. For what minimum value of F, block A starts slipping over B (g=10 m/s2)
Answer» In the figure below, masses $m_{A} = 2 k g$ and $m_{B} = 4 k g$ . For what minimum value of $F$ , block A starts slipping over B $(g = 10 m / s^{2})$

Discussion

38.	A transparent solid sphere of radius 2 cm and density ρ floats in a transparent liquid of density 2ρ kept in a beaker. The bottom of the beaker is spherical in shape with radius of curvature 8 cm and is silvered to make it a concave mirror as shown in the figure. When an object is placed at a distance of 10 cm directly above the centre of the sphere C, its final image coincides with it. Find approximate value of h, the height of the liquid surface in the beaker from the apex of the bottom. Consider the paraxial rays only. The refractive index of the sphere is 32 and that of the liquid is 43.
Answer» A transparent solid sphere of radius $2 cm$ and density $ρ$ floats in a transparent liquid of density $2 ρ$ kept in a beaker. The bottom of the beaker is spherical in shape with radius of curvature $8 cm$ and is silvered to make it a concave mirror as shown in the figure. When an object is placed at a distance of $10 cm$ directly above the centre of the sphere $C$ , its final image coincides with it. Find approximate value of $h$ , the height of the liquid surface in the beaker from the apex of the bottom. Consider the paraxial rays only. The refractive index of the sphere is $\frac{3}{2}$ and that of the liquid is $\frac{4}{3}$ .

Discussion

39.	Identify the lightning conductor and the copper plate in the figure.
Answer» Identify the lightning conductor and the copper plate in the figure.

Discussion

40.	57.A sphere having charge +q is surrounded by a uncharged shell. At this time their potential difference is &quotV". Now the uncharged shell is given a charge of -3q. The new potential difference will be ??
Answer» 57.A sphere having charge +q is surrounded by a uncharged shell. At this time their potential difference is "V". Now the uncharged shell is given a charge of -3q. The new potential difference will be ??

Discussion

41.	Electrons are emitted from metal surface when light falls on it . Is this statement true or false ?
Answer» Electrons are emitted from metal surface when light falls on it . Is this statement true or false ?

Discussion

42.	A solid disc and a ring, both of radius 10 cm are placed on a horizontal table simultaneously, with initial angular speed equal to 10 p rad s-1. Which of the two will start to roll earlier ? The co-efficient of kinetic friction is μ _k = 0.2.
Answer» A solid disc and a ring, both of radius 10 cm are placed on a horizontal table simultaneously, with initial angular speed equal to 10 p rad s-1. Which of the two will start to roll earlier ? The co-efficient of kinetic friction is μ _k = 0.2.

Discussion

43.	a person applies a force f on a box inside a moving train. If S1 is the displacement of box w.r.t. train and S2 is the displacement of train w.r.t. grounf, then the work done by the person in the frame of earth will be1. F. S12. F.S23. F. (S1+S2)4. F. (S1- S2)
Answer» a person applies a force f on a box inside a moving train. If S1 is the displacement of box w.r.t. train and S2 is the displacement of train w.r.t. grounf, then the work done by the person in the frame of earth will be 1. F. S1 2. F.S2 3. F. (S1+S2) 4. F. (S1- S2)

Discussion

44.	If uncertainty in position and momentum are equal, then uncertainty in velocity is?
Answer» If uncertainty in position and momentum are equal, then uncertainty in velocity is?

Discussion

45.	With what speed should a body with thrown upward so that the distance Traversed in 5th second and 6 that second are equal
Answer» With what speed should a body with thrown upward so that the distance Traversed in 5th second and 6 that second are equal

Discussion

46.	A particle is moving along the positive x-axis and at t=0, the particle is at x=0. The acceleration of the particle is a function of time. The acceleration at any time t is given by a=2(1–[t])where [t] is the greatest integer function. Assuming that the particle is at rest initially, the correct graph to show the variation of velocity versus time for the interval 0<t<4 s is
Answer» A particle is moving along the positive $x$ -axis and at $t = 0$ , the particle is at $x = 0$ . The acceleration of the particle is a function of time. The acceleration at any time $t$ is given by $a = 2 (1 - [t])$ where $[t]$ is the greatest integer function. Assuming that the particle is at rest initially, the correct graph to show the variation of velocity versus time for the interval $0 < t < 4 s$ is

Discussion

47.	17.How the net dipole moment of an atom for diamagnetic material is zero?
Answer» 17.How the net dipole moment of an atom for diamagnetic material is zero?

Discussion

48.	A spherical hole is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is
Answer» A spherical hole is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

48.

A spherical hole is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

Answer»

A spherical hole is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

Discussion

49.	A lightly loaded full journal bearing has journal diameter of 50 mm, bush bore of 50.05 mm and bush length of 20 mm. If rotational speed of journal is 1200 rpm and average viscosity of liquid lubricant is 0.03 Pa s, the power loss (in W) will be
Answer» A lightly loaded full journal bearing has journal diameter of 50 mm, bush bore of 50.05 mm and bush length of 20 mm. If rotational speed of journal is 1200 rpm and average viscosity of liquid lubricant is 0.03 Pa s, the power loss (in W) will be

Discussion

50.	If a ball is dropped from any height what Will be its distance travelled in 4th second.
Answer» If a ball is dropped from any height what Will be its distance travelled in 4th second.

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

Two electric bulbs whose resistances are in the ratio of 1:2 are connected in series. The powers dissipated in them have the ratio -

if rate of reaction is incresed to two times with every 10 degree rise in temprature then if we raise the temprature by 40 degree new rate will be

Find the Electric Field inside a Hollow Negatively charged uniform Sphere(radius R) at a distance X from the centre?(where x is ;0

in He–Ne laser, metastable state exist in (1)He (2)Ne (3)both 1 and 2 (4) non

The ratio of escape velocities of two planets, if g value on the two planets are 9.9 m/s2 and 3.3 m/s2 and their radii are 6400 km and 3200 km respectively is

A cube of wood supporting 200 g mass just floats in water. When mass is removed cube rises by 2 cm. What is side of cube in cm? (Density of water = 1000 kgm3)

The length of a conical pendulum is l=2 m and its bob has a mass of m=0.2 kg. The string will break if the tension T exceeds 4 N and g=10 m/s2. Then the smallest angle the string can make with the horizontal is

The range of a particle when thrown at angle of 15∘ with the horizontal is 1.5 km. What maximum range can the particle achieve if speed of projection is kept constant?

What is mean by enthalpy and entropy

A force →F=2xy2^i+2x2y^j acts on a particle. The particle starts from point (1,2) and moves to the point (3,4). The total work done by the force →F on the particle is

An equilateral triangular loop of side L is carrying current i. Suddenly a magnetic field of magnitude B is switched on parallel to one of the sides of loop. Maximum angular velocity of loop if its mass is m is

When air is replaced by a dielectric medium of constant k , the maximum force of attraction between two charges separated by a distance

two particles P and Q having magnitude of position 4 units and 5 units respectively are inclined at angle of 2/3 The magnitude of position of particle P with respect to particle Q is

30. Two slits are separated by 0.32 mm. A beam of 500 nm light strikes the slits producing an interference pattern. Determine the number of maxima observed in the angular range of -30^°

The FBD of the frame and the person for the figure shown is

A steel rod of 10 mm diameter is loaded with a force of 20 kN. Change in diameter of the rod is 3.82×10−3 mm . Given, Young's modulus for steel is 200 GPa, find its Poisson's ratio.

If the attraction force between two bodies separated by R is F, then find the force between them at distance (R+d).

If ∫dx(x2−1)√x=p⋅ln∣∣∣f(x)−1f(x)+1∣∣∣+q⋅tan−1(g(x))+C.Then the value of f(4)p−q⋅g(1)=(Where p,q are fixed constants and C is integration constant)

A block of weight W is kept on an inclined surface whose angle of inclination is θ with horizontal. The component of weight along the incline is

Obtain the angular momentum of a particle moving with uniform velocity about any point outside its trajectory.

34. A uniform circular ring of mass 3 kg and radius 20 cm is rotating about an axis passing through its diameter with an angular speed of 200 rpm with the help of a motor. When the motor is switched off, calculate the torque that must be applied to the ring to bring it to rest in 20 revolutions.

the velocity v of a particle moving along x axis varies with its position as v=asquare root x where a is a cons†an t which of the following graph represent the variation of its acceleration a with time i

The Poisson's ratio is defined as

An uniform cable of mass M and length L is placed on a horizontal surface such that its (Ln) th part is hanging below the edge of the surface. To lift the hanging part of the cable upto the surface, the work done should be

How Rydberg constant value :109677 cm Change to -2.1810 power eighteen

A thin equiconvex glass lens of refractive index 1.5has power of 5D. When the lens is immersed in aliquid of refractive index u, it acts as a divergentlens of focal length 100 cm. The value ofliquid isof(1) 4/3(2) 3/4(3) 5/3(4) 8/3ter 8 P Rod

Isotopes are atoms having

Weight of a body decreases by 1.5% when it is raised to a height h above the surface of earth. When the same body is taken to same depth h in a mine, its weight will show.

In the figure shown, a string is wound over a cylinder A. The other end of the string is attached to block B through a pulley. When the system is released the cylinder rolls down without slipping. The ratio of magnitude of vertical component of displacement of A and B in any time interval t is

The current flowing through the Zener diode in the figure is

Choose the correct relation regarding potential of an electric dipole. Here A, B, C and D all are at equal distance from point O which is much larger than the dimensions of the dipole. Then

In the figure below, masses mA=2 kg and mB=4 kg. For what minimum value of F, block A starts slipping over B (g=10 m/s2)

Identify the lightning conductor and the copper plate in the figure.

57.A sphere having charge +q is surrounded by a uncharged shell. At this time their potential difference is &quotV". Now the uncharged shell is given a charge of -3q. The new potential difference will be ??

Electrons are emitted from metal surface when light falls on it . Is this statement true or false ?

A solid disc and a ring, both of radius 10 cm are placed on a horizontal table simultaneously, with initial angular speed equal to 10 p rad s-1. Which of the two will start to roll earlier ? The co-efficient of kinetic friction is μ _k = 0.2.

a person applies a force f on a box inside a moving train. If S1 is the displacement of box w.r.t. train and S2 is the displacement of train w.r.t. grounf, then the work done by the person in the frame of earth will be1. F. S12. F.S23. F. (S1+S2)4. F. (S1- S2)

If uncertainty in position and momentum are equal, then uncertainty in velocity is?

With what speed should a body with thrown upward so that the distance Traversed in 5th second and 6 that second are equal

17.How the net dipole moment of an atom for diamagnetic material is zero?

A spherical hole is made in a solid sphere of radius R. The mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

A lightly loaded full journal bearing has journal diameter of 50 mm, bush bore of 50.05 mm and bush length of 20 mm. If rotational speed of journal is 1200 rpm and average viscosity of liquid lubricant is 0.03 Pa s, the power loss (in W) will be

If a ball is dropped from any height what Will be its distance travelled in 4th second.