Look at the activities listed blew. Reson out whether or not work is done in the light of your understanding of the term 'work'. A wind-mill is lifting water from a well.

Look at the activities listed below. Reson out whether or not work is done in the light of your understanding of the term work. Suma is swimming in a pond.

Look at the activites listed below. Reason out whether or not work is done in the light of your understanding of the term 'work'. (a) Suma is swimming in a pond. (b) A donkey is carrying a load on its back. (c ) A wind -mill is lifting water from a well. (d) A green plant is carrying out photosynthesis. (e ) An engine is pulling a train. (f) Food grains are getting drired in the Sun. (g) A saliboat is moving due to wind energy.

Water is lifted from a well of depth 50m .If mass of water is 20Kg and weight of the rope is 0.2Kg and per metre the amount of work done is

A gas in a cyclinder is held at a constant pressure of 2.30xx10^5 Pa and is cooled and compressed from 1.70m^3 to 1.20m^3 . The internal energy of the gas decreases by 1.40xx10^5J . (a) Find the work done by the gas. (b) Find the absolute value |Q| of the heat flow into or out of the gas and state the direction of the heat flow. (c) Does it matter whether or not the gas is ideal? Why or why not?