Dear Student,

First Part:

• The air at the closed end is not free to vibrate so a node is fromed at the closed end.
• While the air at the open end is free to vibrate with maximum amplitude so an antinodes is formed at this end.
• This is the simplest mode of vibration and it is called fundamental mode.

Second Part:

This frequency is called the fifth harmonic or second overtone. Thus we see that frequencies of the modes of vibrations are in the ratio n:n1:n2: = 1:3:5 This shows that only odd harmonics are present in the modes of vibrations of the air column closed at one end.

Thank You.

Hello Dear,

The change in the pitch when there is a relative motion between source and observer is called Doppler's effect. Let a source at rest be emitting the waves of frequency f and wavelength λ. Let V be the velocity of wave emitted by source V=fλ. Let the distance between source and observer be V. Please elaborate your question and feel free to ask your doubts here for quick resolution of your query.

good Luck

Dear aspirant,

For finding the center of mass for two mass system we need to know the formulas which is( mass1*coordinate of x1) +(mass2*coordinate of X2)/ (mass1+mass2) and for y coordinate apply the same process which has been applied for finding x coordinate.

(B) Both A and R are true but R is not correct explanation of A

Acceleration decreases according to formula g′=g(1−R2h), where h is either height or depth and R is radius of earth. So, Acceleration due to gravity decreases as height or depth increases.

(A) Both A and R are true and R is the correct explanation of A

Sound waves are longitudinal in nature and light waves are transverse in character. Moreover light wave is electromagnetic in nature. That's why light waves do not need a material medium for its propagation. Moreover sound wave requires material medium for it's propagation.

Hello,

The rocket works because of the law of conservation of linear momentum. The law of conservation of linear momentum is very important in physics. Momentum is defined as the mass of an object times its velocity. Newtons third law of motion works on the rocket. It states that, 'to every action, there is always an equal and opposite reaction'. In the case of a rocket, the engine emits hot burning gases in the downward direction. These gases apply an equal and opposite reaction force to the rocket in the upward direction. This is how a rocket is propelled.

Hello candidate,

1. The handle open the door is always provided at the age of a dog because if it is provided at the lock them then it would not be able to generate enough call in order to provide a rotational motion to the door in order to open it.

2. If two masses on moving with velocities V1 and V2, then the velocity of centre of mass is equal to m1V1 + m2V2/ (m2+M1).

3. Normal reaction refers to a equal and opposite for switch the body produces upon which the forces acting upon.

Hope this information helps you!!

Hello Candidate,

In the first question, a particle Executes SHM of amplitude A. It's Velocity will be maximum at the point of maximum displacement which is equal to +-A, velocity will be zero at the equilibrium point. The acceleration of the particle will be maximum at the equilibrium point will be zero at maximum displacement.

The mercury collects itself upon falling on a surface because of its high contact angle which is approximately equal to 135 degrees.

Hope This information helps you!!

Hi,

11km/s.

Escape speed of a body from Earth's surface is given by: vmin = 2gR. This expression is obtained by conservation of energy and doesn't involve in which direction the body is thrown/projected. So, irrespective of the angle of projection, escape speed of the body from Earth's surface remains constant i.e. ≈11 km/s

Hello candidate,

The maximum speed of a car on a level circular road of radius of curvature r, so that it can move without skidding is equal to v= √R* g* cos theta, where theta is angle of elevation. So, the maximum speed is independent of the mass of car.

In the second part of the question, force is divided in three components and the displacement is divided into two components, but no question has been mentioned this needs to be solved.

Hope it helps!!