Camels require very little water because they are able to tolerate relatively large changes in their body temperature. while humans keep their body temperatures constant to within one or two celsius degrees, a dehydrated camel permits its body temperature to drop to 34.0∘c overnight and rise to 40.0∘c during the day. (note: the specific heat of a camel or other mammal is about the same as that of a typical human, 3480 j/(kg⋅k). the heat of vaporization of water at 34∘c is 2.42 × 106 j/kg

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.

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.