Arod of length l is pivoted about its left end and has a force f applied perpendicular to the other end. the force f is now removed and another force f' is applied at the midpoint of the rod. if f' is at an angle of 30° with respect to the rod, what is its magnitude of the resultant torque is the same as when f was applied

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.