In an electrically heated home. the temperature of the ground in contact with a concrete basement wall is 13.4 C. The temperature at the inside surface of the wall is 19.4 C. The wall is 0.18 m thick and has an area of 6.1 m2. Assume that one kilowatt hour of electrical energy costs $010. How many hours are required for one dollar's worth of energy to be conducted through the wall? Number n Units v In an aluminum pot. 0.861 kg of water at 100 C boils away in four minutes. The bottom of the pot is 3.14 x 10'3 m thick and has a surface area of 0.0160 m2. To prevent the water from boiling too rapidly. a stainless steel plate has been placed between the pot and the heating element. The plate is 1.06 x 10'3 m thick. and its area matches that of the pot. Assuming that heat is conducted into the water only through the bottom of the pot. nd the temperature in degrees Celsius at the steel surface in contact with the heating element. Number a Units v A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.73 m. With the string hanging vertically, the object is given an initial velocity of 1.3 m/s parallel to the ground and swings upward in a circular arc. Eventually, the object comes to a momentary halt at a point where the string makes an angle Swith its initial vertical orientation and then swings back downward. Find the angle 6