Una nadadora quiere cruzar un rio de 100 m de anchura en dirección perpendicular a la corriente , pero llega a un punto de la orilla opuesta 20m aguas abajo. Calcula la velocidad de la corriente si ella va a 2 m/s

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.