Laws of Motion — Physics STD 11 Science — Question

Write the first law of thermodynamics.

Do specific heat and latent heat have the same dimensions?

Two converging lenses of unequal focal lengths can be used to reduce the aperture of a parallel beam of light without losing the energy of the light. This increases the intensity. Describe how the converging lenses should be placed to do this.

In the above given problem if the lower thread is pulled with a jerk, what happens?

Is it correct to call heat as the energy in transit?

If the angular momentum of a body is found to be zero about a point, is it necessary that it will also be zero about a different point?

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 a man in lifting a bucket out of a well by means of a rope tied to the bucket.

What is the thermodynamical work in a reversible process?