1.Under normal atmospheric pressure what temperature does: i. Ice turn to water?
ii. water turn to steam?

2.In which order do the following take place during water purification?

a)chlorination b)screening c)filtration d)sedimentation

b. Which of these processes ensures that the water contains no harmful microorganisms

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Abearing is designed to a reduce friction b. support a load c.guide moving parts such as wheels, shafts and pivots d. all of the above

He viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will

The ratio of lift to drag l/d for a wing or airfoil is an important aerodynamic parameter, indeed, it is a direct measure of the aerodynamic efficiency of the wing. if a wing is pitched through a range of angle of attack, l/d first increases, then goes through a maximum, and then decreases. consider an infinite wing with an naca 2412 airfoil. estimate the maximum value of l/d. assume that the reynolds number is 9x10^6.