Which of these correctly shows what happens when two magnets are placed side by side?
a. n__s 《 《n__s
b. s__n》 《n__s
c. s__n《 》s__n
d. n__s《 》s__n

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.

How does the amount of energy required to hold each proton and neutron in the nucleus compare to the energy released when they are removed?

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.