Work, Energy and Power — Physics STD 10 — Question

A boy of mass m climbs up a staircase of vertical height h. What is the work done by the boy against the force of gravity? What would have been the work done if he uses a lift in climbing the same vertical height?

How is mechanical advantage related to the velocity ratio for an ideal machine?

Name the scientist who discovered Microwaves

How does a magnetic field set up by a solenoid change when strength of current in the solenoid is decreased?

Two resistors of 4Ω and 6Ω are connected in parallel to a cell to draw 0.5 A current from the cell.
Draw a labelled circuit diagram showing the above arrangement.

Explain when we carry weight, on one hand, we bend on the other side.

A metal ball of mass 2kg is allowed to fall freely from rest from a height of 5m above the ground.
What happens to the mechanical energy after the ball hits the ground and comes to rest ?

What is the latent heat of fusion of ice?

Which of the radiations α, β and γ is similar to a beam of electrons?