In your textbook reading Chapter 26, the author suggests that an electric vehicle (EV) fleet can be used as a kind of distributed energy storage strategy. He assumes 1/3 of EVs might contribute 20% of their storage capacity to this scheme. The US has ~270 million registered vehicles. A recent paper has suggested that the US could generate ALL of its electricity from wind and solar, provided that there is 12 hours worth of storage for the whole country. The US generated 4,015 billion kWh in 2017, so an average 12-hr chunk of supply is 5.5 billion kWh. If we all drove EVs with batteries as in problem 3, could this distributed EV scheme provide the energy storage we require to live on just solar and wind? Show your calculaltions

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.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

What is the measure of how much matter is in an object and that can be measured using a balance? a. height b. volume c. weight d. mass