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

Water is slowly coming out from a vertical pipe. As the water descends after coming out, its area of cross-section reduces. Explain this on the basis of the equation of continuity.

Draw position-time graph for a body at rest.

A ball is thrown in the air. Is the ball is momentum conserved when it is in air? If not, then why not?

Why does a child feel more pain when she falls down on a hard cement floor, than when she falls on the soft muddy ground in the garden?

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 applied force in 10s.

To stop a moving bicycle, should we apply big or small brake?

When two flat pieces of lead are pressed why do they stick?

What is the moment of inertia of a sphere of mass 20kg and radius m about its diameter?

Write two advantages in choosing the wavelength of a light radiation as a standard of length.

Write copper, steel, glass and rubber in the order of increasing coefficient of elasticity.