PART - 1 CH - 5Work, Energy and Power — Physics STD 11 Science — Question

What is the basis for the second Law of Kepler?

It becomes easier to spray the water in which some soap is dissolved, explain it.

State the number of significant figures in the following:
0.0006032m²

Why do two layers of a cloth of equal thickness provide warmer covering than a single layer of cloth of double the thickness?

Can the curve in the displacement-time graph be perpendicular to the time axis?

Which of the following examples represent (nearly) simple harmonic motion and which represent periodic but not simple harmonic motion?
The rotation of earth about its axis.

A body of mass 2kg initially at rest moves under the action of an applied horizontal force of 7N on a table with coefficient of kinetic friction = 0.1. Compute the:
Work done by the net force on the body in 10s.

There are equal number of molecules of hydrogen and oxygen in a box. If a tiny hole is made in the box, which gas will leak out rapidly and why?

Suppose we define a quantity 'Linear Pomentum' as linear pomentum = mass × speed. The linear pomentum of a system of particles is the sum of linear pomenta of the individual particles. Can we state a principle of conservation of linear pomentum as ''linear pomentum of a system remains constant if no external force acts on it?''