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Physics - Class 11

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201 Views

Derive an expression for optimum velocity of a car on a circular level road.

anirudha vats 30th Mar, 2021

Hey,

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447 Views

Two masses 6kg and 2kg are at(6,-7)and (2,10) respectively. What is the centre of mass of the system of these two masses

Subhrajit Mukherjee 29th Mar, 2021

Here lets assume m1 = 6kg and the corresponding position vector be r1=6i-7j and for m2 = 2 kg and corresponding position vector r2=2i+10j.

Now CM = m1r1+m2r2/(m1+m2)=(20/7) i - (11/7) j

Thus the center of mass will be located in the coordinate (20/7,-11/7)

I hope this answer helps. All

1921 Views

A particle executes SHM of amplitude A. At what positions of its displacement (X) will its,(1) velocity be zero and maximum and (2) acceleration be zero and maximum?.

chandni deb 29th Mar, 2021

Dear Student,

  • In SHM, the velocity is maximum at the equilibrium position
  • Velocity is zero at the extreme position
  • Further if the velocity is maximum, the acceleration is zero, meaning that the acceleration is zero whenever the object is at the initial position or the displacement of the particle is
239 Views

The work done by a force is given by the area of a. Time -displacement graph b. Force -acceleration graph c. Velocity -time graph

chandni deb 29th Mar, 2021

Dear Student,

  • Work is defined as the product of work and displacement.
  • Hence, the work done by force is found by finding the area under the force displacement graph.
474 Views

The maximum speed of a car on a level circular road of radius of curvature R, without skidding will be a. Independent of coefficient of friction b. Independent of mass c. Independent of R d.independent of g

Subhrajit Mukherjee 29th Mar, 2021

Given, Radius of Curvature = R

Let, Static Friction = U

Now the centripetal force is providing the friction between the tyre and the road i.e.,

mv^2/R = Umg

=> v = (URg)^1/2

  • Thus the Maximum speed will be independent of Mass.

I hope this answer helps. All the very

883 Views

Show that for small oscillations the motion of the simple pendulum is simple harmonic .Derive an expression for its time period. Does it depend on the mass of the bob. What is stokes law?. Derive an expression for the terminal velocity of a sphere falling through a viscous fluid.

Ayush 30th Mar, 2021

Hello candidate,

For small oscillations, of a pendulum the angle taken between the two bobs were taken to be sin (theta), but we take the value of sin theta equal to theta. So, the expression for the time period of small oscillations is equal to 2π× √(length of the pendulum/

113 Views

Describe various modes of vibration of air column in a closed pipe. Show that a closed pipe can produce only odd harmonics (b). What are beats ?.Discuss the formation of Beats graphically.

Abir Gayen 30th Mar, 2021

The various modes of vibration of air column are:

The air at the closed end is not free to vibrate so a node is formed at the closed end. While the air at the open end is free to vibrate with maximum amplitude so an antinode is formed at this

80 Views

An elastic spring of force constant K is compressed by an amount x. Show that is potential energy is 1/2 Kx 34. State Pascals law . Explain the working of hydraulic lift on the basis of Pascals law. 35. Define SHM. Also derive the differential equation of SHM.

Vibhanshu 29th Mar, 2021

34. Hydraulic lift works on the principle of Pascal's law which states that if any force is applied to any point of a confined fluid, then the pressure is equally and undiminished transmitted through out the liquid.

35. Simple Harmonic Motion or SHM is defined as a motion in which

873 Views

1. Identify conservative and nonconservative forces given below and write one main difference between them on the basis of work done. 2.Frictional force, electrostatic force ,gravitational force and viscous force

Ujjwal Kumawat 28th Mar, 2021

A conservative force is one for which the work done is independent of path. Equivalently, a force is conservative if the work done over any closed path is zero. A non - conservative force is one for which the work done depends on the path

Gravitational force/ electrostatic force =If

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