Suppose a woman does 463 j of work and dissipates 8,854 j of heat in the process. (a) what is the decrease in her internal energy, assuming no change in temperature or consumption of food? (that is, there is no other energy transfer.) kcal (b) what is her efficiency? %

Suppose you were asked to find the torque about point p due to the normal force n in terms of given quantities. which method of finding the torque would be the easiest to use?

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.

In a good thermo flask the main cause of heat loss is