Thermodynamics — Physics STD 11 Science — Question

State First law of thermodynamics.

One often comes across the following kind of statement concerning circular motion. A particle moving uniformly along a circle experiences a force directed towards the centre and an equal and opposite force directed away from the centre. The two forces together keep the particle in equilibrium. Explain, what is wrong with this statement?

The breaking force for a wire is F. What will be the breaking force for

1. Two parallel wires of this size,
2. For a single wire of double thickness?

For most of the surfaces used in daily life, the friction coefficient is less than 1. Is it always necessary that the friction coefficient is less than 1?

When will the Kepler's law be applicable on the planets?

Under which condition (i) the centre of buoyancy coincides with the centre of gravity (ii) the centre of buoyancy does not coincide with the centre of gravity.

When a bomb explodes in mid-air, at its highest point, what is the direction of motion of its core?

Why should the difference between the frequencies be less than 10 to produce beats?

State if the following statements is true or false. Give reasons for your answer:
Total energy of a system is always conserved, no matter what internal and external forces on the body are present.