Which is more; the energy needed to raise the temperature of 1kg of water from 20°C to 100°C or the energy needed to boil 1 kg of water at 100°C. Specific heat capacity of water = 4200 J/(kg 0C) Specific latent heat of vaporization of water = 2300 000 J/kg.[Show calculations]

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.

Afrequency generator sends a 550 hz sound wave through both water and ice. what is the difference in wavelength between the wave produced in ice and the wave produced in water?

What is friction? how does it affect the motion of an object?