physics ncert solutions class 11th

The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200rpm to 3120 in 16 seconds. The angular acceleration in $\mathrm{r}\mathrm{a}\mathrm{d}/{\mathrm{s}}^2$  is:

The ratio of the radius of gyration of a thin uniform disc about an axis passing through its centre and normal to its plane to the radius of gyration of the disc about its diameter is :

Two objects of mass $10\mathrm{k}\mathrm{g}$ and $20\mathrm{k}\mathrm{g}$ respectively are connected to the two ends of a rigid rod of length 10 $\mathrm{m}$ with negligible mass. The distance of the centre of mass of the system from the $10\mathrm{k}\mathrm{g}$  mass is :

The temperature of a gas is $-{50}^{?}\mathrm{C}$ . To what temperature ${327}^{?}\mathrm{C}$ the gas should be heated so that the rms speed is increased by 3 times?

A vehicle travels half the distance with speed  $\mathrm{v}$ and the remaining distance with speed $2\mathrm{v}$ . Its average speed is:

The projectile motion of a particle of mass 5g is shown in the figure. The initial velocity of the projectile is 5√2 ms?¹ and air resistance is assumed to be negligible. The magnitude of change in momentum between the points A to B is x*10?² kg ms?¹.

The value of x, to the nearest integer, is.

Consider a sample of oxygen behaving like an ideal gas. At 300K, the ratio of root mean square (rms) velocity to the average velocity of gas molecule would be :
(Molecular weight of oxygen is 32 g/mol ; R = 8.3 JK^-1 mol^-1)

A solid cylinder of mass m is wrapped with an inextensible light string and is placed on a rough inclined plane as shown in the figure. The frictional force acting between the cylinder and the inclined plane is:
[ the coefficient of static friction, μs is 0.4]

Suppose you have taken a dilute solution of oleic acid in such a way that its concentration becomes 0.01cm³ of oleic acid per cm³ of the solution. Then you make a thin film of this solution (monomolecular thickness) of area 4cm² by considering 100 spherical drops of radius ³√(3/(40π)) * 10⁻³ cm. Then the thickness of oleic acid will be x * 10⁻¹⁴ m. Where x is ______.

What will be the average value energy along one degree of freedom for an ideal gas in thermal equilibrium at a temperature T? (kB is Boltzmann constant)