Recent questions tagged class11

A uniform rod of mass 20 kg and length 1.6 m is pivoted at its end and swings in the vertical plane. Angular acceleration of the rod just after the rod is released from rest in the horizontal position

asked Nov 27, 2013 by meena.p

1 answer

One end of a long uniform rod of mass m and length l is clamped. The rod lies on a smooth horizontal surface and rotates on it about the clamped end with a uniform angular velocity w. The force exerted by the clamp on the rod has a horizontal component.

asked Nov 27, 2013 by meena.p

1 answer

The state of hybridization of Boron in $BCl_3$

asked Nov 27, 2013 by sreemathi.v

1 answer

A uniform solid cylinder of mass M and radius R rotates about a frictionless axle. Two masses are suspended from a rope wrapped around the cylinder. If the system is released from rest, the tension in each rope is

asked Nov 27, 2013 by meena.p

1 answer

A cylinder of mass M and radius R is fixed on a frictionless axle over a well. A rope of negotiable mass is wrapped around the cylinder . A bucket of mass m is suspended from it. The linear acceleration of the bucket will be

asked Nov 27, 2013 by meena.p

1 answer

A body is rotating uniformly about a vertical axis fixed in an initial frame. The resultant force on a particle not on the the axis is

asked Nov 27, 2013 by meena.p

0 answers

AB and CD are two identical rods each of length l and mass m joined to form a cross. The moment of inertia of three two rods about a bisector XY of angles between the rods is

asked Nov 27, 2013 by meena.p

1 answer

Two particles of masses $m_1$ and $m_2$ are connected to a rigid massless rod of length r to constitute a dumb bell which is free to move in the plane. The moment of inertia of the dumb bell about an axis perpendicular to the plane passing through the centre of mass

asked Nov 26, 2013 by meena.p

1 answer

Four spheres of diameter 2a and mass M are placed with their centres on the four corners of a square of side b. Then the moment of inertia of the system about an axis along one of the sides of the square is

asked Nov 26, 2013 by meena.p

1 answer

A thin wire of length l and mass m is bent in the form of a semicircle as shown. Its moment of inertia about an axis joining its free ends will be

asked Nov 26, 2013 by meena.p

1 answer

A solid sphere of mass M, radius R and having moment of inertia about an axis passing through the centre of mass as I, is recast into a disc of thickness t, whose moment of inertia about axis passing through its edge and perpendicular to the plane remains I. Then, radius of the disc will be

asked Nov 26, 2013 by meena.p

1 answer

In a rectangular lamina shown in figure $AB= \large\frac{BC}{2}$. The moment of inertia of the lamina is minimum along the axis passing through

asked Nov 26, 2013 by meena.p

1 answer

A thin rod of length l and mass m is turned at mid- point 0 at an angle of $60^{\circ}$ . The moment of inertia of the rod about an axis passing through 0 and perpendicular to the plane of the rod will be

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a uniform rod of length L and mass M, about an axis passing through $L/4$ from one end and perpendicular to its length is

asked Nov 26, 2013 by meena.p

1 answer

From a disc of mass M and radius R, a smaller disc of radius $\large\frac{R}{2}$ is cut out as shown. The moment of inertia of the remaining portion about an axis through the centre 0 and perpendicular to the plane of the disc is

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a semicircular ring about an axis perpendicular to its plane and passing through its centre of mass. (mass M,Radius R)

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a square lamina about one of the diagonals is :

asked Nov 26, 2013 by meena.p

1 answer

A uniform triangular plate of mass m whose vertices are ABC and has length $l, \frac{l}{2}$ and $\large\frac{l}{\sqrt 2}$. Find the moment of inertia of this plate about an axis passing through the point B and perpendicular to the plane of the plate

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a portion of a disc about an axis perpendicular to its plane; Mass of the object is M and radius R is

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of three uniform rods of mass M and length l joined to form an equilateral triangle, about an axis passing through one of its sides.

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a thin rod of mass M and length l about an axis as shown .

asked Nov 26, 2013 by meena.p

1 answer

Moment of inertia of a rectangular plate about an axis passing through its centre and perpendicular to its plane

asked Nov 25, 2013 by meena.p

1 answer

The moment of inertia of a uniform rectangular plate about an axis passing through its midpoint and parallel to its length l is

asked Nov 25, 2013 by meena.p

1 answer

If the moment of inertia of a disc about an axis tangential and parallel to the surface is I.Then find the moment of inertia about the axis tangential but perpendicular to the surface in terms of the I?

asked Nov 25, 2013 by meena.p

1 answer

Three rings each of mass M and radius R are arranged as shown. The moment of inertia of the system about $YY'$ will be

asked Nov 25, 2013 by meena.p

1 answer

The moment of inertia of a sphere of mass M and radius R about an axis passing through centre is $\large\frac{2}{5}\;$$MR^2$. The radius of gyration of the sphere about a parallel axis to the sphere is

asked Nov 25, 2013 by meena.p

1 answer

On a uniform rod of length l and mass M, two identical masses m are kept at the extreme ends. What is the moment of inertia of the system about an axis passing through its center and perpendicular to its length ?

asked Nov 25, 2013 by meena.p

1 answer

A torque of $20\; Nm$ acting on a rigid body produces are angular acceleration of $4 rad /s^2$ What is the moment of inertia of the rigid body rotating about the fixed axis?

asked Nov 25, 2013 by meena.p

1 answer

A torque of $30\; N-m$ is applied on a 5 kg wheel whose moment of inertia is $2 kg\;m^2$ for $10 \;seconds$. The angle covered by the wheel in $10\; s$ will be

asked Nov 25, 2013 by meena.p

1 answer

A wheel has moment of inertia $5 \times 10^{-3} kg m^2$ and is making $20\; kw/s$ The torque needed to stop it in 10 s is

asked Nov 25, 2013 by meena.p

1 answer

A particle of mass m is projected with a speed U at an angle $\theta$ with the horizontal. Find the torque of the weight of the particle about the point of projection when the particle is at the highest point .

asked Nov 25, 2013 by meena.p

1 answer

A force $\overrightarrow {F} = 3 \hat i +2 \hat j -4 \hat k$ acts at the point $(1,-1,2)$. Whta is its torque about the point $(2,-1,3)$?

asked Nov 25, 2013 by meena.p

1 answer

A simple pendulum of length l is pulled aside to make an angle $\theta$ with the vertical. What is the magnitude of the torque of the weight of the bob about the point of suspension ?

asked Nov 25, 2013 by meena.p

1 answer

What is the torque of the force $\overrightarrow {F}=-3 \hat i +\hat j+ 5 \hat k$ acting at a point whose position vector vector is $\overrightarrow {r}= 7 \hat i+3 \hat j +\hat k?$

asked Nov 25, 2013 by meena.p

1 answer

The direction of the angular velocity vector is along

asked Nov 25, 2013 by meena.p

1 answer

A wheel is rotating at $900 \;rpm$ about its axis. When the power is cut off, it comes to rest in 1 minute. The angular retardation in $rad/s^2$ is

asked Nov 25, 2013 by meena.p

1 answer

The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the acceleration for 10 seconds, it starts rotating at 4500 revolutions per minute. The angular acceleration of the wheel is

asked Nov 25, 2013 by meena.p

1 answer

When a ceiling fan is switched on, it makes 10 rotations in the first 3 seconds. Assuming uniform angular acceleration, of how many revolutions it will make in the next 3 seconds?

asked Nov 25, 2013 by meena.p

1 answer

A wheel rotates with a constant acceleration of $2.0\;radians /s^2$. If the wheel starts from rest, the number of revolutions it makes in the first $10$ seconds will be approximately

asked Nov 25, 2013 by meena.p

1 answer

A wheel has a speed of 1200 revolution per minute and is made to slow down at a rate of $4\;radian/s^2$. The number of revolutions it makes before coming to rest is

asked Nov 25, 2013 by meena.p

1 answer

If a fly wheel makes 120 revolutions per minute then its angular speed will be

asked Nov 25, 2013 by meena.p

1 answer

Two particles A and B each of mass m are attached by a light inextensible string of length 2l. The whole system lies on a smooth horizontal table with B initially at a distance l from A. The particle at the end B is projected across the table with speed is perpendicular to AB. velocity of ball A just after the **** is

asked Nov 24, 2013 by meena.p

1 answer

A particle of mass m and velocity V collides obliquely elastically with a stationary particle of mass 'm'. The angle between the velocity vectors of the two particles after the collision is

asked Nov 24, 2013 by meena.p

1 answer

A particle of mass m strikes elastically with a disc of radius R, with a velocity $\overrightarrow {v}$ as shown. If the mass of the disc is equal to that of the particle and the surface of contact is smooth, then the velocity of disc just after the collision is

asked Nov 24, 2013 by meena.p

1 answer

Two identical billiard balls are in contact on a smooth table. A third identical ball strikes them symmetrically and come to rest after impact. The coefficient of restitution is

asked Nov 24, 2013 by meena.p

1 answer

A sphere of mass $m_1= 2 kg$ collides with a sphere of mass $m_2= 3 kg$ which is at rest. Mass $m_1$will move at right angles to the line joining the centres at the time of collision,the coefficient of restitution is

asked Nov 24, 2013 by meena.p

1 answer

If in the expansion of $(x+a)^{15},$ the $11^{th}$ term is $G.M.$ of $8^{th} $ & $12^{th}$ terms, then which term is the greatest term?

asked Nov 24, 2013 by rvidyagovindarajan_1

1 answer

If the sum of $5^{th}\:and\:6^{th}$ terms in the expansion of $(a-b)^n$, $n\geq5$, is 0, then $\large\frac{a}{b}$ = ?

asked Nov 24, 2013 by rvidyagovindarajan_1

1 answer

If the sum of the coefficients of $(1+x)^n=4096$, then the largest coefficient is ?

asked Nov 24, 2013 by rvidyagovindarajan_1

1 answer

The value of $^nC_0.^{2n}C_r$ - $^nC_1^{2-2}C_r$ + $^nC_2.^{2n-4}C_r$ - ...., if $r \lt n$ is

asked Nov 24, 2013 by rvidyagovindarajan_1

1 answer

Ask Questions, Get Answers