- What is the change in internal energy of a car if you put 12.0 gal of gasoline into its tank? The energy content of gasoline is 1.3 x 108. All other factors, such as the car’s temperature, are constant.
- How much heat transfer occurs from a system, if its internal energy decreased by 150 J while it was doing 30.0 J of work?
- A system does 1.80 x 108 J of work while 7.50 x 108 J of heat transfer occurs to the environment. What is the change in internal energy of the system assuming no other changes (such as in temperature or by the addition of fuel)?
- What is the change in internal energy of a system which does of work while of heat transfer occurs into the system, and of heat transfer occurs to the environment?
- Suppose a woman does 500 J of work and 9500 J of heat transfer occurs into the environment 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.) (b) What is her efficiency?
- Steam to drive an old-fashioned steam locomotive is supplied at a constant gauge pressure of (about 250 psi) to a piston with a 0.200-m radius. (a) By calculating , find the work done by the steam when the piston moves 0.800 m. Note that this is the network output, since gauge pressure is used. (b) Now find the amount of work by calculating the force exerted times the distance traveled. Is the answer the same as in part (a)?
Sample Solution