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##### Water flows through a hose whose internal diameter is 1 \mathrm{~cm} at a speed of 1 \mathrm{~ms}^{-1} . What should be the diameter of the nozzle if the water is to emerge at 21 \mathrm{~ms}^{-1} ?

Explain how the swing is produced in a fast moving cricket ball.

For which position will the maximum blood pressure in the body have the smallest value. (a) Standing up right (b) Sitting (c) Lying horizontally (d) Standing on ones head?

What gauge pressure is required in the city mains for a stream flow a fire hose connected to the city mains to reach a vertical height of 15 \mathrm{~m} ?

Explain the difference between laminar flow and turbulent flow.

An airplane wing is designed so that when the speed of the air across the top of the wing is 450 \mathrm{ms}^{-1} the speed of air below the wing is 410 \mathrm{~ms}^{-1} . What is the pressure difference between the top and bottom of the wings? (Density of air =1.29 \mathrm{kgm}^{-3} ).

The radius of the aorta is about 1.0 \mathrm{~cm} and the blood flowing through it has a speed of about 30 \mathrm{cms}^{-1} . Calculate the average speed of the blood in the capillaries using the fact that although each capillary has a diameter of about 8 \times 10^{-4} \mathrm{~cm} there are literally millions of them so that their total cross section is about 2000 \mathrm{~cm}^{2} .