Tags Class 11th

Class 11th

Get insights from 8k questions on Class 11th, answered by students, alumni, and experts. You may also ask and answer any question you like about Class 11th

Follow Ask Question

Questions

Discussions

Active Users

Followers

New answer posted

a month ago

Class 11th Physics Mechanical Properties of Fluids

A rain drop of radius r falls in air with terminal velocity v. What is the terminal velocity of a rain drop of radius 3r?

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

$v_{T} \propto r^{2}$

$\frac{v_{T_{1}}}{v_{T_{2}}} = \frac{r_{1}^{2}}{r_{2}^{2}} = \frac{r^{2}}{9 r^{2}}$

0 0

New answer posted

a month ago

Class 11th Physics System of Particles and Rotational Motion

Two circular rings (of same material) are of same thickness. The diameter of first ring is twice that of second. The moment of inertia of first ring as compared to that of second is

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$\frac{l_{1}}{l_{2}} = \frac{M_{1} R_{1}^{2}}{M_{2} R_{2}^{2}} = \frac{ρ * 2 π R_{1} * R_{1}^{2}}{ρ * 2 π R_{2} * R_{2}^{2}} = \frac{R_{1}^{3}}{R_{2}^{3}} = \frac{8}{1}$

0 0

New answer posted

a month ago

Class 11th Physics System of Particles and Rotational Motion

In rotational motion of a rigid body about an axis, particles move with

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

In rotational motion, angular velocity of every particle on rigid body will be same. But linear velocity is given as v = $r ω .$

0 0

New answer posted

a month ago

Class 11th Physics System of Particles and Rotational Motion

A body of moment of inertia 4 kg m2 rotating with an angular speed of 4 rad/s has the 4x J of kinetic energy. Determine the value of x.

0 Follower 2 Views

Vishal Baghel

Contributor-Level 10

$K . E = \frac{1}{2} l ω^{2}$

$K . E = \frac{1}{2} * 4 * 16 = 32 = 4 * 8 J$

0 0

New answer posted

a month ago

Class 11th Physics

An insect of mass m = 2g is inside a vertical drum of radius 1m that is rotating with an angular velocity of 10 rad/s. If the insect does not fall off then the minimum coefficient of friction is

0 Follower 1 View

Vishal Baghel

Contributor-Level 10

$f ? m g$

$? ? m r ?^{2} ? m g$

$? ? = \frac{g}{r ?^{2}} = \frac{10}{1 * 100} = 0.1$

0 0

New answer posted

a month ago

Class 11th Physics

A particle moves in a circular orbit of radius r under a central attractive force F = $- \frac{k}{r},$ k is constant. The time period of its motion is proportional to

0 Follower 3 Views

Vishal Baghel

Contributor-Level 10

$F = m r ω^{2} = \frac{k}{r}$

$\begin{array}{l} \Rightarrow ω \propto \frac{1}{r} \\ \Rightarrow T \propto r \end{array}$

0 0

New answer posted

a month ago

Class 11th Work, Energy and Power

The position x of a particle of mass 2kg moving along straight line is given as x = (t – 2)², where t is in second and x is in metre. The work done by the force in first 2s is

0 Follower 4 Views

Vishal Baghel

Contributor-Level 10

$\begin{array}{l} \Rightarrow x = {(t - 2)}^{2} \\ \Rightarrow v = 2 t - 4 \end{array}$

$v_{t = 0} = - 4 m / s$

$v_{t = 2} = 0 m / s$

Work done $= Δ K$

$\Rightarrow W = \frac{1}{2} m * 0 - \frac{1}{2} * 2 * 16$

=> W = 16 J

0 0

New answer posted

a month ago

Class 11th Physics

A car is moving in a circular horizontal track of radius 10 $m$ with a constant speed of 10 $m / s$ . A bob is suspended from the roof of the car by a light wire of length 1.0 $m$ . The angle made by the wire with the vertical is