Mechanical Properties of Fluids — Physics STD 12 Science — Question

A system releases \(125 kJ\) of heat while \(104 kJ\) of work is done on the system. Calculate the change in internal energy of the gas.

What is a linear isotropic dielectric? Give one example.

An electron in an atom is revolving round the nucleus in a circular orbit of radius \(5.3 \times 10^{-11} m\) with a speed of\(3 \times 10^6 m / s\). Find the angular momentum of electron.

State any two conditions for steady interference pattern

A solenoid of length π m and 5 cm in diameter has a winding of 1000 turns and carries a current of 5 A. Calculate the magnetic field at its centre along the radius.

In a cyclotron, magnetic field of \(3.5 Wb / m ^2\) is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed? (Mass of proton \(=1.67 \times 10^{-27} kg\), Charge on proton \(=1.6 \times 10^{-19} C\) )

Two circular discs A and B, having the same mass, have four identical small circular discs placed on them, as shown in the diagram. They are simultaneously released from rest at the top of an inclined plane. If the discs roll down without slipping, which disc will reach the bottom first?

Discuss how pure rolling (i.e., rolling without slipping) on a plane surface is a combined translational and rotational motion.

Calculate the de-Broglie wavelength of an electron moving with one fifth of the speed of light. Neglect relativistic effects. \(\left(h=6.63 \times 10^{-34} J . s ., c =3 \times 108 m / s\right.\), mass of electron \(\left.=9 \times 10^{-31} kg \right)\)

instead of rotating only one of the polaroids, you rotate both polaroids simultaneously in the same direction?