4. A 10 kg block of iron is dropped into a 10 kg pool of water. The temperature of the iron is initially at 20 C, and the temperature of the water is initially at 100 C. Circle all the statements that are true. (5 pts) The sum of heat in the iron and water decreases. ST!\" The sum of heat in the iron and water stays the same. The sum of heat in the iron and water increases. 9-9 Heat moves from water into the iron. Heat moves from iron into the water Heat moves so that heat in the iron is equal to heat in the water. Heat moves so that the nal temperatures of the iron and water are equal. WWW.\" The nal temperature of the water will be less than 20C. i. The nal temperature of the water will be greater than 20C and less than 100 C. j. The nal temperature of the water will be greater than 100C. 5. (a) You need to bring 1 cup of water (240 g) from room temperature (20C) to a boil (100C). How much energy is needed to do this? The specic heat of water is 4190 J/kg C. (5 pts) (b). Once the 1 cup of water reaches 100C, you plan to boil o' all the water. How much more energy is needed to do this? The latent heat for vaporization of water is 2.3 X 106 J I kg. (5 pts)