Units and Measurements — Physics STD 11 Science — Question

What is R in the gas equation PV = nRT? Value of R write in liter atmosphere per Kelvin per mole.

What is Newton's law of cooling?

Is the complete kinetic energy dissipated in a perfectly elastic collision?

How is mean free path depends on number density of the gas?

What do you mean by order of magnitude of a length? Write the order of magnitude of following lenghts.

1. Size of a hydrogen atom.
2. Diameter of earth.
3. Light year.
4. Size of milky way.

Write two uses of v-t graph?

A cylindrical object of outer diameter 20cm and mass 2kg floats in water with its axis vertical. If it is slightly depressed and then released, find the time period of the resulting simple harmonic motion of the object.

A mass M is broken into two parts: m and (M - m). How is m related to M so that the gravitational force between two parts is maximum?

Read the following two statements below carefully and state, with reasons, if it is true or false.
The stretching of a coil is determined by its shear modulus.

The sign of work done by a force on a body is important to understand. State carefully if the following quantities are positive or negative:
Work done by the resistive force of air on a vibrating pendulum in bringing it to rest.