A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal. When sleeping, the average adult burns expends about 0.42 Cal/h for every pound of body weight. How long would the person have to sleep continuously to lose 1 lb of body fat? (Assume the person weighs 140 lb.)

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

The radius of an atom is closest in size to a

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false