Aplane flies 1800 miles in 9 hours, with a tailwind all the way. the return trip on the same route, now with a headwind, takes 12 hours. assuming both remain constant, find the speed of the plane and the speed of the wind. [hint: if x is the plane's speed and y the wind speed (in mph), then the plane travels to its destination at xplusy mph because the plane and the wind go in the same direction; on the return trip, the plane travels at xminusy mph.]

Ared apple is illuminated by a blue light the apple will appear

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.

Complete the sentence to describe the law of conservation of energy. the law of conservation of energy states that energy cannot be created