The surface tension of a liquid is to measured using a liquid film sus-pended on a U-shaped wire frame with a 9 cm long movable side. If the force neededto move the wire is 0.045 N, determine the surface tension of this liquid in air

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