How much heat is needed to completely vaporize 20 grams of ice, initially at 5oF? (Note that initial temperature is given in Fahrenheit.)

A stone of mass 13 kg is dropped into a tank of water from just above the watersurface. The tank contains 100kg of water which is 1.3m deep. The stone has aspecific heat of 1000 J/kgK and water 4200 J/kgK. If the water and stone are initiallyat the same temperature, determine the temperature rise f the water. State anyassumptions made answer: 3.8x10^-4K

In some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 170 L of liquid nitrogen, which has a density of 808 kg/m3.   (a)Calculate the heat needed in kilocalories to evaporate this amount of liquid nitrogen and raise its temperature to 2.50°C. (You must use cp, and you can assume it is constant over the temperature range.) This is the amount of cooling the liquid nitrogen supplies. _____________________ kcal   (b)What is this in kilowatt-hours? _________ kW · h   (c)How much cooling in kilocalories would be obtained from melting an identical mass of 0°C ice?  ____________kcal

An iron railroad rail is 300 m long at temperature 31. What is its length  when the temperature is  -19?  Coefficient of linear thermal expansion of iron is 12*10-6 .Calculate answer to two decimals.