Many people are familiar with the fact that a rifle recoils when fired. This recoil is the result of
action-reaction force pairs. A gunpowder explosion creates hot gases which expand outward
allowing the rifle to push forward on the bullet. Consistent with Newton's third law of motion,
the bullet pushes backwards upon the rifle. The acceleration of the recoiling rifle is ..
A. greater than the acceleration of the bullet.
B. smaller than the acceleration of the bullet.
Or
C. the same size as the acceleration of the bullet.
Explain your answer.

Na food processing facility, a spherical container of inner radius r1 5 40 cm, outer radius r2 5 41 cm, and ther- mal conductivity k 5 1.5 w/m · k is used to store hot water and to keep it at 100°c at all times. to accomplish this, the outer surface of the container is wrapped with a 800-w electric strip heater and then insulated. the temperature of the inner surface of the container is observed to be nearly 120°c at all times. as- suming 10 percent of the heat generated in the heater is lost through the insulation, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the container, (b) obtain a relation for the variation of temperature in the container material by solving the differential equation, and (c) evaluate the outer surface tempera- ture of the container. also determine how much water at 100°c this tank can supply steadily if the cold water enters at 20°c.

You are about to open a container of soy milk but notice that there are instructions to “shake well before serving.” the soy milk is most likely a

Which law represents the thermodynamic statement of the conservation of energy of a system? a. the fourth law b. the first law c. the second law d. the third law