If the beam is subjected to a shear of v = 30 kn, determine the web's shear stress at a and b. indicate the shear-stress components on a volume element located at these points. set w = 200 mm. show that the neutral axis is located at y = 0.2433 m from the bottom and i = 0.5382(10^-3) m^4. solve the problem for v = 50 kn instead of 30.

An electric kettle is made out of stainless steel, weighs two pounds (when empty) and is equipped with a heating element that consumes 2 kw of electricity. assuming that the water and the kettle are at the same uniform temperature at any moment of time, calculate the shortest possible time to bring 2 quarts of water from room temperature to the onset of boiling