50278 + Interview Questions in Physics

1.	A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of 1012/sec. What is the force constant of the bonds connecting one atom with the other ? (Molecular wt. of silver =108 g and Avagadro number =6.02×1023 gm mole −1 )
Answer» A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of $10^{12} / s e c .$ What is the force constant of the bonds connecting one atom with the other ? (Molecular wt. of silver $= 108 g$ and Avagadro number $= 6.02 \times 10^{23} g m$ mole $^{- 1}$ )

Discussion

2.	A rod OA of mass m and length L is rotating in a horizontal circle about point O as shown in figure. B is the mid-point of rod. If T represents tension in the rod at any point and U represents elastic potential energy per unit volume at any point of rod, then choose correct alternative (s).
Answer» A rod OA of mass m and length L is rotating in a horizontal circle about point O as shown in figure. B is the mid-point of rod. If T represents tension in the rod at any point and U represents elastic potential energy per unit volume at any point of rod, then choose correct alternative (s).

2.

A rod OA of mass m and length L is rotating in a horizontal circle about point O as shown in figure. B is the mid-point of rod. If T represents tension in the rod at any point and U represents elastic potential energy per unit volume at any point of rod, then choose correct alternative (s).

Answer»

A rod OA of mass m and length L is rotating in a horizontal circle about point O as shown in figure. B is the mid-point of rod. If T represents tension in the rod at any point and U represents elastic potential energy per unit volume at any point of rod, then choose correct alternative (s).

Discussion

3.	how can we represent displacement x of SHM in terms of sine function other than cosine.?
Answer» how can we represent displacement x of SHM in terms of sine function other than cosine.?

Discussion

4.	A stone is dropped into a lake from a tower 500m high.what is the time taken by the sound of the splash to be heard by a man on the tower ?(velocity of sound = 340 m/s)
Answer» A stone is dropped into a lake from a tower 500m high.what is the time taken by the sound of the splash to be heard by a man on the tower ?(velocity of sound = 340 m/s)

Discussion

5.	For a given journey, average velocity of a body is zero while its average speed is non - zero. Choose the correct option.
Answer» For a given journey, average velocity of a body is zero while its average speed is non - zero. Choose the correct option.

Discussion

6.	By changing the amount of ____________ linked with the circuit we can induce e.m.f in the circuit.
Answer» By changing the amount of ____________ linked with the circuit we can induce e.m.f in the circuit.

Discussion

7.	A uniform heavy rod of weight W, cross-sectional area A and length L is hanging from a fixed support. Young modulus of the material of the rod is Y. Neglect the lateral contraction. Find the elongation of the rod.
Answer» A uniform heavy rod of weight W, cross-sectional area A and length L is hanging from a fixed support. Young modulus of the material of the rod is Y. Neglect the lateral contraction. Find the elongation of the rod.

Discussion

8.	Magnitude of average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is
Answer» Magnitude of average velocity of a particle moving in a straight line, with constant acceleration $a$ and initial velocity $u$ in first $t$ seconds is

Discussion

9.	A block of mass m moving with a velocity v hits a light spring of stiffness K attached rigidly to a stationary sledge of mass M. Neglecting friction between all contacting surfaces, the maximum compression of the spring is
Answer» A block of mass m moving with a velocity v hits a light spring of stiffness K attached rigidly to a stationary sledge of mass M. Neglecting friction between all contacting surfaces, the maximum compression of the spring is

Discussion

10.	Two equal point charges of 1 μC each are located at (^i+^j+^k)m and (2^i+3^j)+^k)m. The magnitude of the electrostatic force between them is
Answer» Two equal point charges of $1 μ C$ each are located at $(^i +^j +^k) m$ and $(2^i + 3^j) +^k) m$ . The magnitude of the electrostatic force between them is

Discussion

11.	a projectile is thrown in the upward direction making an angle of 60 degree with the horizontal direction with a velocity of 147 metre per second then the time after which its inclination with the horizontal becomes 45 degree is ???? My thinking: Uy= 147sin(60) and. Vy= 147sin(45) Using Vy=Uy-gt What is wrong in my thinking. ?????
Answer» a projectile is thrown in the upward direction making an angle of 60 degree with the horizontal direction with a velocity of 147 metre per second then the time after which its inclination with the horizontal becomes 45 degree is ???? My thinking: Uy= 147sin(60) and. Vy= 147sin(45) Using Vy=Uy-gt What is wrong in my thinking. ?????

Discussion

12.	The bike of a stunt driver can achieve a maximum instantaneous velocity of 40 m/s. He starts at the base of a vertical circular track and intends to complete the vertical circle. What is the maximum radius of the track to ensure the safety of the driver?
Answer» The bike of a stunt driver can achieve a maximum instantaneous velocity of $40 m/s$ . He starts at the base of a vertical circular track and intends to complete the vertical circle. What is the maximum radius of the track to ensure the safety of the driver?

Discussion

13.	A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit?
Answer» A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit?

Discussion

14.	Why electric field is generated in insulator while not in conductor?
Answer» Why electric field is generated in insulator while not in conductor?

Discussion

15.	A large block of ice of 5 my thickness has a vertical hole drilled in it and is floating in a lake the minimum length of the rope required.to draw a bucket full of water through the hole is
Answer» A large block of ice of 5 my thickness has a vertical hole drilled in it and is floating in a lake the minimum length of the rope required.to draw a bucket full of water through the hole is

Discussion

16.	A wave is represented by y=0.1sin(100πt−kx), where y,t,x are in SI units. If wave velocity is 100 m/s, its wave number is
Answer» A wave is represented by $y = 0.1 sin (100 π t - k x),$ where $y, t, x$ are in SI units. If wave velocity is $100 m/s,$ its wave number is

Discussion

17.	Why is a vector represented as a tangent in circular motion
Answer» Why is a vector represented as a tangent in circular motion

Discussion

18.	A bar of iron is 10 cm at 20o C. At 19o C it will be (a of iron = 11 X 10−6/o C)
Answer» A bar of iron is 10 cm at $20^{o} C$ . At $19^{o} C$ it will be (a of iron = 11 X $10^{- 6} /^{o} C$ )

Discussion

19.	Two bodies M and N of equal masses are suspended from two separate massless springs of force constants k1 and k2 respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude M to that of N is
Answer» Two bodies M and N of equal masses are suspended from two separate massless springs of force constants $k_{1}$ and $k_{2}$ respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude M to that of N is

19.

Two bodies M and N of equal masses are suspended from two separate massless springs of force constants k1 and k2 respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude M to that of N is

Answer»

Two bodies M and N of equal masses are suspended from two separate massless springs of force constants $k_{1}$ and $k_{2}$ respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude M to that of N is

Discussion

20.	If the radius of earth contracts 1n of its present value, the length of the day will be approximately
Answer» If the radius of earth contracts $\frac{1}{n}$ of its present value, the length of the day will be approximately

Discussion

21.	Consider the situation as shown in figure. A plane mirror is fixed at a height h above the bottom of a beaker containing water (refractive index μ ) up to a height d. Find the position of the image of the bottom formed by the mirror.
Answer» Consider the situation as shown in figure. A plane mirror is fixed at a height $h$ above the bottom of a beaker containing water (refractive index $μ$ ) up to a height $d$ . Find the position of the image of the bottom formed by the mirror.

Discussion

22.	For 6C14, mass of proton is a, mass of neutron is b and B.E is X. Find the mass of a nucleus of 6C14 (C = speed of light in vacuum)
Answer» For $_{6} C^{14}$ , mass of proton is $a$ , mass of neutron is $b$ and B.E is $X$ . Find the mass of a nucleus of $_{6} C^{14}$ ( $C$ = speed of light in vacuum)

Discussion

23.	(a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its speed ? Is it reasonable ? (b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed ?
Answer» (a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its speed ? Is it reasonable ? (b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed ?

Discussion

24.	Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.
Answer» Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.

24.

Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.

Answer»

Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.

Discussion

25.	27 spherical droplets of radius 3um and each carry 10^-12C of charge are combined to form a bigger drop find capacitance of bigger drop
Answer» 27 spherical droplets of radius 3um and each carry 10^-12C of charge are combined to form a bigger drop find capacitance of bigger drop

Discussion

26.	The seconds hand of a watch has length 6 cm. Speed of the end point and magnitude of difference in velocities at positions A and B, as shown in the figure will be
Answer» The seconds hand of a watch has length $6 c m$ . Speed of the end point and magnitude of difference in velocities at positions $A$ and $B$ , as shown in the figure will be

Discussion

27.	Figure shows a uniform disc of radius R, from which a hole of radius R2 has been cut out from left of the center and is placed on right of the center of disc. Find the centre of mass of the resulting disc.
Answer» Figure shows a uniform disc of radius R, from which a hole of radius $\frac{R}{2}$ has been cut out from left of the center and is placed on right of the center of disc. Find the centre of mass of the resulting disc.

27.

Figure shows a uniform disc of radius R, from which a hole of radius R2 has been cut out from left of the center and is placed on right of the center of disc. Find the centre of mass of the resulting disc.

Answer»

Figure shows a uniform disc of radius R, from which a hole of radius $\frac{R}{2}$ has been cut out from left of the center and is placed on right of the center of disc. Find the centre of mass of the resulting disc.

Discussion

28.	In an electromagnetic wave in free space, the root mean square value of the electric field is Erms=6 V/m. The peak value of the magnetic field is
Answer» In an electromagnetic wave in free space, the root mean square value of the electric field is $E_{r m s} = 6 V / m$ . The peak value of the magnetic field is

Discussion

29.	What is meant by kinematics?
Answer» What is meant by kinematics?

Discussion

30.	A source of sound of frequency 50 Hz is producing longitudinal waves in air. The amplitude of vibrations of air particles is 5mm and the speed of the wave is 330ms−1. Write the equation of the wave.
Answer» A source of sound of frequency $50 H z$ is producing longitudinal waves in air. The amplitude of vibrations of air particles is 5mm and the speed of the wave is $330 m s^{- 1}$ . Write the equation of the wave.

30.

A source of sound of frequency 50 Hz is producing longitudinal waves in air. The amplitude of vibrations of air particles is 5mm and the speed of the wave is 330ms−1. Write the equation of the wave.

Answer»

A source of sound of frequency $50 H z$ is producing longitudinal waves in air. The amplitude of vibrations of air particles is 5mm and the speed of the wave is $330 m s^{- 1}$ . Write the equation of the wave.

Discussion

31.	A ball of mass m is attached to one end of a light rod of length l, the other end being hinged. What minimum velocity u should be imparted to the ball downwards, so that it can complete the circle?
Answer» A ball of mass $m$ is attached to one end of a light rod of length $l$ , the other end being hinged. What minimum velocity $u$ should be imparted to the ball downwards, so that it can complete the circle?

Discussion

32.	The magnetic field at the origin due to the current flowing in the wire is
Answer» The magnetic field at the origin due to the current flowing in the wire is

Discussion

33.	A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is
Answer» A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

Discussion

34.	What will be the expression for the angular magnification produced by the telescope?
Answer» What will be the expression for the angular magnification produced by the telescope?

Discussion

35.	If a line makes angles of 30∘ and 45∘ with x-axis and y-axis, then the angle made by it with z-axis is
Answer» If a line makes angles of $30^{\circ}$ and $45^{\circ}$ with x-axis and y-axis, then the angle made by it with z-axis is

Discussion

36.	Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.
Answer» Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.

Discussion

37.	The selling rate of a radioactive isotope is decided by its activity. What will be the second-hand rate of a one month old 32P(t12=14.3 days) source if it was originally purchased for 800 rupees ?
Answer» The selling rate of a radioactive isotope is decided by its activity. What will be the second-hand rate of a one month old $^{32} P (t_{\frac{1}{2}} = 14.3 days)$ source if it was originally purchased for 800 rupees ?

Discussion

38.	Teh index of refraction of fused quartz is 1.472 for light of wavelength 400 nm and is 1.452 for hight of wavelength 760 nm. Find the speeds of ight of these wavelengths in fused quartz.
Answer» Teh index of refraction of fused quartz is 1.472 for light of wavelength 400 nm and is 1.452 for hight of wavelength 760 nm. Find the speeds of ight of these wavelengths in fused quartz.

Discussion

39.	The resultant of →P and →Q is perpendicular to →P. What is the angle between →P and →Q
Answer» The resultant of $\to P$ and $\to Q$ is perpendicular to $\to P$ . What is the angle between $\to P$ and $\to Q$

Discussion

40.	The focal length of the objective lens of a compound microscope is [CPMT 1985; MNR 1986; M
Answer» The focal length of the objective lens of a compound microscope is [CPMT 1985; MNR 1986; M

Discussion

41.	An electron passing near a positively charged nucleus should get accelerated due to the attractive force, and it's speed should increase. But the opposite is observed! It's found to get slowed down. Why do you think?
Answer» An electron passing near a positively charged nucleus should get accelerated due to the attractive force, and it's speed should increase. But the opposite is observed! It's found to get slowed down. Why do you think?

Discussion

42.	Two bodies are projected with the same, initial velocity such that they have the same range. Heights attained by the bodies are 50 m and 32 m. Find the range.
Answer» Two bodies are projected with the same, initial velocity such that they have the same range. Heights attained by the bodies are 50 m and 32 m. Find the range.

Discussion

43.	If tan α=m(m+1),tan β=1(2m+1),thenα+β=(nϵZ)
Answer» $I f t a n α = \frac{m}{(m + 1)}, t a n β = \frac{1}{(2 m + 1)}, t h e n α + β = (n ϵ Z)$

Discussion

44.	On a horizontal smooth plane, a particle collides with the rod hinged at one point(as shown in the figure) and sticks to it. Find the final angular velocity of the system.
Answer» On a horizontal smooth plane, a particle collides with the rod hinged at one point(as shown in the figure) and sticks to it. Find the final angular velocity of the system.

44.

On a horizontal smooth plane, a particle collides with the rod hinged at one point(as shown in the figure) and sticks to it. Find the final angular velocity of the system.

Answer»

On a horizontal smooth plane, a particle collides with the rod hinged at one point(as shown in the figure) and sticks to it. Find the final angular velocity of the system.

Discussion

45.	A balloon contains 1500 m3 of helium gas at 27 ∘C and 4 atm . The volume of helium gas at −3 ∘C and 2 atm will be
Answer» A balloon contains $1500 m^{3}$ of helium gas at $27^{\circ} C$ and $4 atm$ . The volume of helium gas at $- 3^{\circ} C$ and $2 atm$ will be

Discussion

46.	Following graphs show the motion of a body. Pick the odd graph which does not conform to the motion of the body.
Answer» Following graphs show the motion of a body. Pick the odd graph which does not conform to the motion of the body.

Discussion

47.	A square plate of side 2 m contains a charge uniformly distributed over one of its side, such that the surface charge density σ is 10C/m2. The net charge on the square surface is n coulombs, where n is a natural number. The value of n is __.
Answer» A square plate of side 2 m contains a charge uniformly distributed over one of its side, such that the surface charge density $σ$ is $10 C / m^{2}$ . The net charge on the square surface is n coulombs, where n is a natural number. The value of n is __.

Discussion

48.	Question 1 (a) The following is the distance-time table of an object in motion: Time in secondsDistance in metres001128327464512562167343 (a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?
Answer» Question 1 (a) The following is the distance-time table of an object in motion: $\begin{matrix} T i m e i n s e c o n d s & D i s t a n c e i n m e t r e s 0 & 0 1 & 1 2 & 8 3 & 27 4 & 64 5 & 125 6 & 216 7 & 343 \end{matrix}$ (a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?

Discussion

49.	The position of centre of mass of a system consisting of two particles of masses m1 and m2 separated by a distance L apart, from m1 will be
Answer» The position of centre of mass of a system consisting of two particles of masses $m_{1}$ and $m_{2}$ separated by a distance L apart, from $m_{1}$ will be

Discussion

50.	If I had a long cylindrical balloon filled with air and I leave it out in the open for a while. Will the gases arrange themselves according to their density ?
Answer» If I had a long cylindrical balloon filled with air and I leave it out in the open for a while. Will the gases arrange themselves according to their density ?

Discussion

Explore topic-wise InterviewSolutions in Current Affairs.

A silver atom in a solid oscillates in simple harmonic motion in some direction with a frequency of 1012/sec. What is the force constant of the bonds connecting one atom with the other ? (Molecular wt. of silver =108 g and Avagadro number =6.02×1023 gm mole −1 )

A rod OA of mass m and length L is rotating in a horizontal circle about point O as shown in figure. B is the mid-point of rod. If T represents tension in the rod at any point and U represents elastic potential energy per unit volume at any point of rod, then choose correct alternative (s).

how can we represent displacement x of SHM in terms of sine function other than cosine.?

A stone is dropped into a lake from a tower 500m high.what is the time taken by the sound of the splash to be heard by a man on the tower ?(velocity of sound = 340 m/s)

For a given journey, average velocity of a body is zero while its average speed is non - zero. Choose the correct option.

By changing the amount of ____________ linked with the circuit we can induce e.m.f in the circuit.

A uniform heavy rod of weight W, cross-sectional area A and length L is hanging from a fixed support. Young modulus of the material of the rod is Y. Neglect the lateral contraction. Find the elongation of the rod.

Magnitude of average velocity of a particle moving in a straight line, with constant acceleration a and initial velocity u in first t seconds is

A block of mass m moving with a velocity v hits a light spring of stiffness K attached rigidly to a stationary sledge of mass M. Neglecting friction between all contacting surfaces, the maximum compression of the spring is

Two equal point charges of 1 μC each are located at (^i+^j+^k)m and (2^i+3^j)+^k)m. The magnitude of the electrostatic force between them is

The bike of a stunt driver can achieve a maximum instantaneous velocity of 40 m/s. He starts at the base of a vertical circular track and intends to complete the vertical circle. What is the maximum radius of the track to ensure the safety of the driver?

A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit?

Why electric field is generated in insulator while not in conductor?

A large block of ice of 5 my thickness has a vertical hole drilled in it and is floating in a lake the minimum length of the rope required.to draw a bucket full of water through the hole is

A wave is represented by y=0.1sin(100πt−kx), where y,t,x are in SI units. If wave velocity is 100 m/s, its wave number is

Why is a vector represented as a tangent in circular motion

A bar of iron is 10 cm at 20o C. At 19o C it will be (a of iron = 11 X 10−6/o C)

Two bodies M and N of equal masses are suspended from two separate massless springs of force constants k1 and k2 respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the amplitude M to that of N is

If the radius of earth contracts 1n of its present value, the length of the day will be approximately

Consider the situation as shown in figure. A plane mirror is fixed at a height h above the bottom of a beaker containing water (refractive index μ ) up to a height d. Find the position of the image of the bottom formed by the mirror.

For 6C14, mass of proton is a, mass of neutron is b and B.E is X. Find the mass of a nucleus of 6C14 (C = speed of light in vacuum)

(a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its speed ? Is it reasonable ? (b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed ?

Determine the point of application of net force, when forces of 20 N &amp; 30 N are acting on the rod as shown in figure.

27 spherical droplets of radius 3um and each carry 10^-12C of charge are combined to form a bigger drop find capacitance of bigger drop

The seconds hand of a watch has length 6 cm. Speed of the end point and magnitude of difference in velocities at positions A and B, as shown in the figure will be

Figure shows a uniform disc of radius R, from which a hole of radius R2 has been cut out from left of the center and is placed on right of the center of disc. Find the centre of mass of the resulting disc.

In an electromagnetic wave in free space, the root mean square value of the electric field is Erms=6 V/m. The peak value of the magnetic field is

What is meant by kinematics?

A source of sound of frequency 50 Hz is producing longitudinal waves in air. The amplitude of vibrations of air particles is 5mm and the speed of the wave is 330ms−1. Write the equation of the wave.

A ball of mass m is attached to one end of a light rod of length l, the other end being hinged. What minimum velocity u should be imparted to the ball downwards, so that it can complete the circle?

The magnetic field at the origin due to the current flowing in the wire is

A rocket has a mass of 100 kg. 90% of this is fuel. It ejects fuel vapours at the rate of 1 kg/sec with a velocity of 500 m/sec relative to the rocket. It is supposed that the rocket is outside the gravitational field. The initial upthrust on the rocket when it just starts moving upwards is

What will be the expression for the angular magnification produced by the telescope?

If a line makes angles of 30∘ and 45∘ with x-axis and y-axis, then the angle made by it with z-axis is

Write any two distinguishing features between conductors, semiconductors and insulators on the basis of energy band diagrams.

The selling rate of a radioactive isotope is decided by its activity. What will be the second-hand rate of a one month old 32P(t12=14.3 days) source if it was originally purchased for 800 rupees ?

Teh index of refraction of fused quartz is 1.472 for light of wavelength 400 nm and is 1.452 for hight of wavelength 760 nm. Find the speeds of ight of these wavelengths in fused quartz.

The resultant of →P and →Q is perpendicular to →P. What is the angle between →P and →Q

The focal length of the objective lens of a compound microscope is [CPMT 1985; MNR 1986; M

An electron passing near a positively charged nucleus should get accelerated due to the attractive force, and it's speed should increase. But the opposite is observed! It's found to get slowed down. Why do you think?

Two bodies are projected with the same, initial velocity such that they have the same range. Heights attained by the bodies are 50 m and 32 m. Find the range.

If tan α=m(m+1),tan β=1(2m+1),thenα+β=(nϵZ)

On a horizontal smooth plane, a particle collides with the rod hinged at one point(as shown in the figure) and sticks to it. Find the final angular velocity of the system.

A balloon contains 1500 m3 of helium gas at 27 ∘C and 4 atm . The volume of helium gas at −3 ∘C and 2 atm will be

Following graphs show the motion of a body. Pick the odd graph which does not conform to the motion of the body.

A square plate of side 2 m contains a charge uniformly distributed over one of its side, such that the surface charge density σ is 10C/m2. The net charge on the square surface is n coulombs, where n is a natural number. The value of n is __.

Question 1 (a) The following is the distance-time table of an object in motion: Time in secondsDistance in metres001128327464512562167343 (a) What conclusion can you draw about the acceleration? Is it constant, increasing, decreasing, or zero?

The position of centre of mass of a system consisting of two particles of masses m1 and m2 separated by a distance L apart, from m1 will be

If I had a long cylindrical balloon filled with air and I leave it out in the open for a while. Will the gases arrange themselves according to their density ?

Determine the point of application of net force, when forces of 20 N & 30 N are acting on the rod as shown in figure.