Q. A cyclist starts from the centre 0 of a circular ground of radius 1 km, reaches the edge A of the ground and then travels along the circumference upto B and then reaches the centre along BO as shown in figure. If he takes 10 minutes to complete this journey, find (i) the net displacement,
(ii) average velocity and
(iii) averagof the cyclist.

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.