50278 + Interview Questions in Physics

1.	A beam of light propagates through a medium 1 and falls onto another medium 2 at an angle 45∘. After that, it propagates in medium 2 at an angle 30∘. The light's wavelength in medium 1 is 141.4 ˙A. Wavelength has the light in medium 2 in Angstorms is
Answer» A beam of light propagates through a medium $1$ and falls onto another medium $2$ at an angle $45^{\circ}$ . After that, it propagates in medium $2$ at an angle $30^{\circ}$ . The light's wavelength in medium $1$ is $141.4 ˙ A .$ Wavelength has the light in medium 2 in Angstorms is

Discussion

2.	For a transparent medium, relative permeability, μr=1.0 and relative permittivity, ϵr=1.44. The velocity of light in this medium will be -
Answer» For a transparent medium, relative permeability, $μ_{r} = 1.0$ and relative permittivity, $ϵ_{r} = 1.44$ . The velocity of light in this medium will be -

Discussion

3.	A car is moving at a speed of 72km/hr on a road having 2% upward gradient. The driver applies brakes when he sees an obstruction. If his reaction time is 1.5seconds, assuming that the coefficient of friction between the pavement and tyre as 0.15, calculate the distance traversed before the car finally stops
Answer» A car is moving at a speed of $72 k m / h r$ on a road having $2 %$ upward gradient. The driver applies brakes when he sees an obstruction. If his reaction time is $1.5 seconds$ , assuming that the coefficient of friction between the pavement and tyre as $0.15$ , calculate the distance traversed before the car finally stops

Discussion

4.	Two masses m and m/2 are connected at the two ends of a massless rigid rod of length l. The rod is suspended by a thin wire of torsional constant K at the centre of mass of the rod - mass system as shown in the figure. Because of torsional constant K, the restoring torque is τ=Kθ for angular displacement θ.If the rod is rotated by θ∘ and released so that rod oscillates. The tension in the rod, when it passes through its mean position will be
Answer» Two masses $m$ and $m / 2$ are connected at the two ends of a massless rigid rod of length $l$ . The rod is suspended by a thin wire of torsional constant $K$ at the centre of mass of the rod - mass system as shown in the figure. Because of torsional constant $K$ , the restoring torque is $τ = K θ$ for angular displacement $θ .$ If the rod is rotated by $θ_{\circ}$ and released so that rod oscillates. The tension in the rod, when it passes through its mean position will be

Discussion

5.	Why is it necessary to swipe the credit card rather than holding it motionless in the card reader's slot?
Answer» Why is it necessary to swipe the credit card rather than holding it motionless in the card reader's slot?

Discussion

6.	A block of mass m rests on rough inclined plane with inclination at 40∘ to the horizontal and is just about to slip. What is the coefficient of friction between the plane and the block?
Answer» A block of mass $m$ rests on rough inclined plane with inclination at $40^{\circ}$ to the horizontal and is just about to slip. What is the coefficient of friction between the plane and the block?

Discussion

7.	78. 3 equal point charges of charge + q each are moving along a circle of radius r and a point charge - 2q is placed at the centre of the circle if charges are revolving with constant and same speed in the circle then calculate the speed of the charges
Answer» 78. 3 equal point charges of charge + q each are moving along a circle of radius r and a point charge - 2q is placed at the centre of the circle if charges are revolving with constant and same speed in the circle then calculate the speed of the charges

Discussion

8.	The acceleration (in m/s2) of movable pulley P is and block B is , if acceleration of block A=1 m/s2 downwards.
Answer» The acceleration (in $m / s^{2}$ ) of movable pulley P is and block B is , if acceleration of block $A = 1 {m/s}^{2}$ downwards.

Discussion

9.	Four identical hollow cylindrical columns of mild steel support a big structure of mass 50,000 kg. The inner and outer radii of each column are 30 and 60 cm respectively. Assuming the load distribution to be uniform, calculate the compressional strain of each column.
Answer» Four identical hollow cylindrical columns of mild steel support a big structure of mass 50,000 kg. The inner and outer radii of each column are 30 and 60 cm respectively. Assuming the load distribution to be uniform, calculate the compressional strain of each column.

Discussion

10.	a body is projected horizontally with speed v_0. find the velocity of the body when it covers equal dis†an ces in horizontal and vertical directio
Answer» a body is projected horizontally with speed v_0. find the velocity of the body when it covers equal dis†an ces in horizontal and vertical directio

Discussion

11.	A stone is tied to a string of length l and is whirled in a vertical circle with the other end of the string as the center. At a certain instant of time, the stone is at its lowest position and has a speed u. The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is
Answer» A stone is tied to a string of length $l$ and is whirled in a vertical circle with the other end of the string as the center. At a certain instant of time, the stone is at its lowest position and has a speed $u$ . The magnitude of the change in velocity as it reaches a position where the string is horizontal ( $g$ being acceleration due to gravity) is

Discussion

12.	Question 7The work done on an object does not depend upon the(a) displacement(b) force applied(c) angle between force and displacement(d) initial velocity of the object
Answer» Question 7 The work done on an object does not depend upon the (a) displacement (b) force applied (c) angle between force and displacement (d) initial velocity of the object

Discussion

13.	54. What is the need for banking of road??
Answer» 54. What is the need for banking of road??

Discussion

14.	Lenz's law gives
Answer» Lenz's law gives

Discussion

15.	A plane is inclined at an angle α=30∘ with respect to the horizontal. A particle is projected with a speed u=2 m/s, from the base of the plane, making an angle θ=15∘ with respect to the plane as shown in the figure. The distance from the base, at which the particle hits the plane is close to [Take g=10 m/s2]
Answer» A plane is inclined at an angle $α = 30^{\circ}$ with respect to the horizontal. A particle is projected with a speed $u = 2 m/s$ , from the base of the plane, making an angle $θ = 15^{\circ}$ with respect to the plane as shown in the figure. The distance from the base, at which the particle hits the plane is close to [Take $g = 10 m / s^{2}]$

Discussion

16.	When value of current increases in p-n junction, then the value of contact potential : 1) decreases 2) increases 3) remains unchanged 4) depends on temperature What is contact potential?
Answer» When value of current increases in p-n junction, then the value of contact potential : 1) decreases 2) increases 3) remains unchanged 4) depends on temperature What is contact potential?

Discussion

17.	Define laws of motion.
Answer» Define laws of motion.

Discussion

18.	A 5m long aluminium wire (Y=7×10^{10} N/m^{-2} )of diameter 3mm supports a 40Kg mass in order to have the same elongation in the copper wire (Y=12×10^{10} N/m^{-2}) of the same length under the same weight the diameter should now be (in mm)
Answer» A 5m long aluminium wire (Y=7×10^{10} N/m^{-2} )of diameter 3mm supports a 40Kg mass in order to have the same elongation in the copper wire (Y=12×10^{10} N/m^{-2}) of the same length under the same weight the diameter should now be (in mm)

Discussion

19.	A particle of charge q and mass m is subjected to an electric field E=E01-ax2 in the x-direction, where a and E0are constants. Initially the particle was at rest at x=0. Other than the initial position the kinetic energy of the particle becomes zero when the distance of the particle from the origin is:
Answer» A particle of charge q and mass m is subjected to an electric field $E = E_{0} (1 - a x^{2})$ in the x-direction, where $a$ and $E_{0}$ are constants. Initially the particle was at rest at $x = 0$ . Other than the initial position the kinetic energy of the particle becomes zero when the distance of the particle from the origin is:

Discussion

20.	Let m1=1kg m2=2kg and m3=3 kg in figure. Find the accelerations of m1,m2, and m3. The string from the upper pulley to m1 is 20 cm when the system is released from rest. How long will it take before m1 strikes the pulley ?
Answer» Let $m_{1} = 1$ kg $m_{2} = 2$ kg and $m_{3} = 3$ kg in figure. Find the accelerations of $m_{1}, m_{2},$ and $m_{3}$ . The string from the upper pulley to $m_{1}$ is 20 cm when the system is released from rest. How long will it take before $m_{1}$ strikes the pulley ?

20.

Let m1=1kg m2=2kg and m3=3 kg in figure. Find the accelerations of m1,m2, and m3. The string from the upper pulley to m1 is 20 cm when the system is released from rest. How long will it take before m1 strikes the pulley ?

Answer»

Let $m_{1} = 1$ kg $m_{2} = 2$ kg and $m_{3} = 3$ kg in figure.

Find the accelerations of $m_{1}, m_{2},$ and $m_{3}$ . The string from the upper pulley to $m_{1}$ is 20 cm when the system is released from rest. How long will it take before $m_{1}$ strikes the pulley ?

Discussion

21.	A capacitor of 4μF charged at 50V is connected with another capacitor of 2μF charged at 100V, in such a way that plates with similar charges are connected together. Before joining and after joining, the total energy will be
Answer» A capacitor of $4 μ F$ charged at $50 V$ is connected with another capacitor of $2 μ F$ charged at $100 V$ , in such a way that plates with similar charges are connected together. Before joining and after joining, the total energy will be

Discussion

22.	An element Δl=Δx ^i is placed at the origin and carries a large current I=10 A, The magnetic field on the y−axis at a distance of 0.5 m is[Take, Δx=1 cm]
Answer» An element $Δ l = Δ x^i$ is placed at the origin and carries a large current $I = 10 A$ , The magnetic field on the $y - axis$ at a distance of $0.5 m$ is $[Take, Δ x = 1 cm]$

Discussion

23.	Two circuits have mutual inductance of 0.09 H. Average e.m.f. induced in the secondary by a change of current from 0 to 20 A in 0.006 s in primary will be
Answer» Two circuits have mutual inductance of 0.09 H. Average e.m.f. induced in the secondary by a change of current from 0 to 20 A in 0.006 s in primary will be

Discussion

24.	Two coherent source whose intensity ratio is 81:1 produce interference frimges. Calculate the ratio of intensity of maxima and minima in the fringe system
Answer» Two coherent source whose intensity ratio is 81:1 produce interference frimges. Calculate the ratio of intensity of maxima and minima in the fringe system

Discussion

25.	Four charges q1=1, q2=2, q3=3and q4=4 in microcolumb are placed at(0,0,0), (1m,0,0), (0,1m,0),(0,0,1m) respectively. Let Fi be the net force acting on ith charge of the given charge then sigmaFi=
Answer» Four charges q1=1, q2=2, q3=3and q4=4 in microcolumb are placed at(0,0,0), (1m,0,0), (0,1m,0),(0,0,1m) respectively. Let Fi be the net force acting on ith charge of the given charge then sigmaFi=

Discussion

26.	Two fixed charges Aand B of 5 microcoulomb each are seperated by a distance of6 cm. C is the mid point of the line joining A and B. A charge 'Q' of -5 microcoulomb is shot perpendicular to the line joining A and B through C with a kinetic energy of 0.06 J. The charge 'Q' comes to rest at a point D. The distance CD is (a) 3m (b) Root 3m (c)3root3m (d) 4m
Answer» Two fixed charges Aand B of 5 microcoulomb each are seperated by a distance of6 cm. C is the mid point of the line joining A and B. A charge 'Q' of -5 microcoulomb is shot perpendicular to the line joining A and B through C with a kinetic energy of 0.06 J. The charge 'Q' comes to rest at a point D. The distance CD is (a) 3m (b) Root 3m (c)3root3m (d) 4m

Discussion

27.	Find frequency of mass in the setup shown below, when displaced from its equilibrium position.
Answer» Find frequency of mass in the setup shown below, when displaced from its equilibrium position.

Discussion

28.	why does the wave nature of a subs†an ce increase when the wavelength increases?
Answer» why does the wave nature of a subs†an ce increase when the wavelength increases?

Discussion

29.	Identify the cell based on the images given below.
Answer» Identify the cell based on the images given below.

Discussion

30.	A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T . If the lift starts accelerating upwards with an acceleration g/3, the time period of pendulum will become
Answer» A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T . If the lift starts accelerating upwards with an acceleration g/3, the time period of pendulum will become

Discussion

31.	A particle is moving in a circle of radius r=2 m. Its speed with time varies according to the relation v(t)=4−6t2. What is the magnitude of the total acceleration of the particle at t=2 sec ? Use the value of √769=27.73 for calculation.
Answer» A particle is moving in a circle of radius $r = 2 m$ . Its speed with time varies according to the relation $v (t) = 4 - \frac{6}{t^{2}}$ . What is the magnitude of the total acceleration of the particle at $t = 2 sec$ ? Use the value of $\sqrt{769} = 27.73$ for calculation.

Discussion

32.	The binding energy per nucleon for C12 is 7.68 MeV and that for C13 is 7.5 MeV. The energy required to remove a neutron from C13 is
Answer» The binding energy per nucleon for $C^{12}$ is $7.68 MeV$ and that for $C^{13}$ is $7.5 MeV$ . The energy required to remove a neutron from $C^{13}$ is

Discussion

33.	the electric field components in figure below are Ex=800x^{2^{}} N/c E_y=Ez=0 calculate a) the flux througu cube b) the charge within the cube
Answer» the electric field components in figure below are Ex=800x^{2^{}} N/c E_y=Ez=0 calculate a) the flux througu cube b) the charge within the cube

Discussion

34.	Jack recieves a package from his uncle's farm. The package contains 12 watermelons, each weighing 1 kg 500 g. What is the total mass of the package in kg?
Answer» Jack recieves a package from his uncle's farm. The package contains $12$ watermelons, each weighing $1$ kg $500$ g. What is the total mass of the package in kg?

Discussion

35.	123. What will be the equivalent resistance?
Answer» 123. What will be the equivalent resistance?

Discussion

36.	Lenses are constructed by a material of refractive index 1.50. The magnitude of the radii of curvature are 20 cm and 30 cm. Find the focal lengths of the possible lenses with the above specifications.
Answer» Lenses are constructed by a material of refractive index 1.50. The magnitude of the radii of curvature are 20 cm and 30 cm. Find the focal lengths of the possible lenses with the above specifications.

Discussion

37.	The masses of the blocks A and B are 0.5 kg and 1 kg respectively. These are arranged as shown in the figure and are connected by a massless string. The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g=10 m/s2)
Answer» The masses of the blocks A and B are $0.5 kg$ and $1 kg$ respectively. These are arranged as shown in the figure and are connected by a massless string. The coefficient of friction between all contact surfaces is $0.4$ . The force, necessary to move the block B with constant velocity, will be $(g = 10 {m/s}^{2})$

Discussion

38.	A closed cubical box is made of perfectly insulating material and the only way for heat to enter or leave the box is through two solid cylindrical metal plugs, each of cross-sectional area 12cm2 and length 8 cm fixed in the opposite walls of the box. The outer surface of one plug is kept at a temperature of 100∘C while the outer surface of the other plug is maintained at a temperature of 4∘C. The thermal conductivity of the material of the plug is 2.0W/m∘C. A source of energy generating 13 W is enclosed inside the box. Find the equilibrium temperature of the inner surface of the box assuming that it is the same at all points on the inner surface.
Answer» A closed cubical box is made of perfectly insulating material and the only way for heat to enter or leave the box is through two solid cylindrical metal plugs, each of cross-sectional area $12 c m^{2}$ and length 8 cm fixed in the opposite walls of the box. The outer surface of one plug is kept at a temperature of $100^{\circ} C$ while the outer surface of the other plug is maintained at a temperature of $4^{\circ} C$ . The thermal conductivity of the material of the plug is $2.0 W / m^{\circ} C$ . A source of energy generating 13 W is enclosed inside the box. Find the equilibrium temperature of the inner surface of the box assuming that it is the same at all points on the inner surface.

Discussion

39.	escape velocity of 1 kg body on a planet is 100m/s .potential energy at that planet i
Answer» escape velocity of 1 kg body on a planet is 100m/s .potential energy at that planet i

Discussion

40.	In a thermodynamics process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20J of heat and 8J of work was done on the gas .If the initial internal energy of the gas was 30J then the final internal energy will be-
Answer» In a thermodynamics process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20J of heat and 8J of work was done on the gas .If the initial internal energy of the gas was 30J then the final internal energy will be-

Discussion

41.	Find wrong term -1,2,2,5,7,10,14,17,23,26
Answer» Find wrong term -1,2,2,5,7,10,14,17,23,26

Discussion

42.	The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is
Answer» The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is

42.

The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is

Answer»

The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is

Discussion

43.	A block of mass m is given a velocity V on long plank of mass M kept on a smooth horizontal surface .the friction Coefficient between the block and plank is mu. find the work done by friction on the system (block + plank )till the instant when relative velocity of block with respect to plank becomes V/2 .
Answer» A block of mass m is given a velocity V on long plank of mass M kept on a smooth horizontal surface .the friction Coefficient between the block and plank is mu. find the work done by friction on the system (block + plank )till the instant when relative velocity of block with respect to plank becomes V/2 .

Discussion

44.	Two square blocks of size a×a is removed from a big square 4a×4a as shown in the figure. Find the COM of the system after removing the square blocks.
Answer» Two square blocks of size $a \times a$ is removed from a big square $4 a \times 4 a$ as shown in the figure. Find the COM of the system after removing the square blocks.

Discussion

45.	A particle is moving with speed v along the line y=3m. Its angular speed about origin is when its x coordinate is 4m is
Answer» A particle is moving with speed v along the line y=3m. Its angular speed about origin is when its x coordinate is 4m is

Discussion

46.	A vector has both magnitude and direction. Does it mean that anything that has magnitude and direction is necessarily a vector ? The rotation of a body can be specified by the direction of the axis of rotation, and the angle of rotation about the axis. Does that make any rotation a vector ?
Answer» A vector has both magnitude and direction. Does it mean that anything that has magnitude and direction is necessarily a vector ? The rotation of a body can be specified by the direction of the axis of rotation, and the angle of rotation about the axis. Does that make any rotation a vector ?

Discussion

47.	A gun fires a bullet of mass 50 g with a velocity of 30 m/s. Due to this, the gun is pushed back with a velocity of 1 m/s, then the mass of the gun is:
Answer» A gun fires a bullet of mass $50 g$ with a velocity of $30 m/s$ . Due to this, the gun is pushed back with a velocity of $1 m/s$ , then the mass of the gun is:

Discussion

48.	The graph showing the dependence of intensity of transmitted light on the angle between polarizer and analyzer is,
Answer» The graph showing the dependence of intensity of transmitted light on the angle between polarizer and analyzer is,

Discussion

49.	Suggest a suitable physical situation for each of the following graphs (Fig 3.22): a) b) c)
Answer» Suggest a suitable physical situation for each of the following graphs (Fig 3.22): a) b) c)

Discussion

50.	A car of mass 1000 kg is moving with the speed 40 m/s on a circular path of radius 400 m. If its speed is increasing at the rate of 3 ms−2 the total force acting on the car is
Answer» A car of mass $1000 kg$ is moving with the speed $40 m/s$ on a circular path of radius $400 m$ . If its speed is increasing at the rate of $3 m s^{- 2}$ the total force acting on the car is

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A beam of light propagates through a medium 1 and falls onto another medium 2 at an angle 45∘. After that, it propagates in medium 2 at an angle 30∘. The light's wavelength in medium 1 is 141.4 ˙A. Wavelength has the light in medium 2 in Angstorms is

For a transparent medium, relative permeability, μr=1.0 and relative permittivity, ϵr=1.44. The velocity of light in this medium will be -

Why is it necessary to swipe the credit card rather than holding it motionless in the card reader's slot?​

A block of mass m rests on rough inclined plane with inclination at 40∘ to the horizontal and is just about to slip. What is the coefficient of friction between the plane and the block?

78. 3 equal point charges of charge + q each are moving along a circle of radius r and a point charge - 2q is placed at the centre of the circle if charges are revolving with constant and same speed in the circle then calculate the speed of the charges

The acceleration (in m/s2) of movable pulley P is and block B is , if acceleration of block A=1 m/s2 downwards.

Four identical hollow cylindrical columns of mild steel support a big structure of mass 50,000 kg. The inner and outer radii of each column are 30 and 60 cm respectively. Assuming the load distribution to be uniform, calculate the compressional strain of each column.

a body is projected horizontally with speed v_0. find the velocity of the body when it covers equal dis†an ces in horizontal and vertical directio

Question 7The work done on an object does not depend upon the(a) displacement(b) force applied(c) angle between force and displacement(d) initial velocity of the object

54. What is the need for banking of road??

Lenz's law gives

When value of current increases in p-n junction, then the value of contact potential : 1) decreases 2) increases 3) remains unchanged 4) depends on temperature What is contact potential?

Define laws of motion.

A 5m long aluminium wire (Y=7×10^{10} N/m^{-2} )of diameter 3mm supports a 40Kg mass in order to have the same elongation in the copper wire (Y=12×10^{10} N/m^{-2}) of the same length under the same weight the diameter should now be (in mm)

Let m1=1kg m2=2kg and m3=3 kg in figure. Find the accelerations of m1,m2, and m3. The string from the upper pulley to m1 is 20 cm when the system is released from rest. How long will it take before m1 strikes the pulley ?

A capacitor of 4μF charged at 50V is connected with another capacitor of 2μF charged at 100V, in such a way that plates with similar charges are connected together. Before joining and after joining, the total energy will be

An element Δl=Δx ^i is placed at the origin and carries a large current I=10 A, The magnetic field on the y−axis at a distance of 0.5 m is[Take, Δx=1 cm]

Two circuits have mutual inductance of 0.09 H. Average e.m.f. induced in the secondary by a change of current from 0 to 20 A in 0.006 s in primary will be

Two coherent source whose intensity ratio is 81:1 produce interference frimges. Calculate the ratio of intensity of maxima and minima in the fringe system

Four charges q1=1, q2=2, q3=3and q4=4 in microcolumb are placed at(0,0,0), (1m,0,0), (0,1m,0),(0,0,1m) respectively. Let Fi be the net force acting on ith charge of the given charge then sigmaFi=

Find frequency of mass in the setup shown below, when displaced from its equilibrium position.

why does the wave nature of a subs†an ce increase when the wavelength increases?

Identify the cell based on the images given below.

A person measures the time period of a simple pendulum inside a stationary lift and finds it to be T . If the lift starts accelerating upwards with an acceleration g/3, the time period of pendulum will become

A particle is moving in a circle of radius r=2 m. Its speed with time varies according to the relation v(t)=4−6t2. What is the magnitude of the total acceleration of the particle at t=2 sec ? Use the value of √769=27.73 for calculation.

The binding energy per nucleon for C12 is 7.68 MeV and that for C13 is 7.5 MeV. The energy required to remove a neutron from C13 is

the electric field components in figure below are Ex=800x^{2^{}} N/c E_y=Ez=0 calculate a) the flux througu cube b) the charge within the cube

Jack recieves a package from his uncle's farm. The package contains 12 watermelons, each weighing 1 kg 500 g. What is the total mass of the package in kg?

123. What will be the equivalent resistance?

Lenses are constructed by a material of refractive index 1.50. The magnitude of the radii of curvature are 20 cm and 30 cm. Find the focal lengths of the possible lenses with the above specifications.

The masses of the blocks A and B are 0.5 kg and 1 kg respectively. These are arranged as shown in the figure and are connected by a massless string. The coefficient of friction between all contact surfaces is 0.4. The force, necessary to move the block B with constant velocity, will be (g=10 m/s2)

escape velocity of 1 kg body on a planet is 100m/s .potential energy at that planet i

In a thermodynamics process pressure of a fixed mass of a gas is changed in such a manner that the gas releases 20J of heat and 8J of work was done on the gas .If the initial internal energy of the gas was 30J then the final internal energy will be-

Find wrong term -1,2,2,5,7,10,14,17,23,26

The centre of an equilateral triangle is O. Three forces F1,F2 and F3 are appointed along AB, BC and AC respectively. The magnitude of F3 so that the total torque about O should be zero is

Two square blocks of size a×a is removed from a big square 4a×4a as shown in the figure. Find the COM of the system after removing the square blocks.

A particle is moving with speed v along the line y=3m. Its angular speed about origin is when its x coordinate is 4m is

A vector has both magnitude and direction. Does it mean that anything that has magnitude and direction is necessarily a vector ? The rotation of a body can be specified by the direction of the axis of rotation, and the angle of rotation about the axis. Does that make any rotation a vector ?

A gun fires a bullet of mass 50 g with a velocity of 30 m/s. Due to this, the gun is pushed back with a velocity of 1 m/s, then the mass of the gun is:

The graph showing the dependence of intensity of transmitted light on the angle between polarizer and analyzer is,

Suggest a suitable physical situation for each of the following graphs (Fig 3.22): a) b) c)

A car of mass 1000 kg is moving with the speed 40 m/s on a circular path of radius 400 m. If its speed is increasing at the rate of 3 ms−2 the total force acting on the car is

Why is it necessary to swipe the credit card rather than holding it motionless in the card reader's slot?