How much heat is needed to completely vaporize 20 grams of ice, initially at 5°F?

A cube of ice is taken from the freezer at -8.5°C and placed in a 100 gram aluminum calorimeter filled with 300 grams of water at a room temperature of 20°C. The final situation is observed to be all water at 17°C. What was the mass of the ice cube? Given the following values: Cice =2100 J/kg/°C, Cwater = 4186 J/kg/°C, Caluminum 920 J/kg/°C, and for water Le 3.33×105 J/kg and Lv = 22.6×105 J/kg. 1

Week 4 #19 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. If two such bars were placed in parallel (side by side) with the ends in the same temperature baths, what would the rate of heat conduction  ? be? ______W

A 365-g sample of an unknown (nongaseous) material experiences a 16.0°C increase in temperature after absorbing 9.93 ✕ 103 J of energy. (a) What is the specific heat of this material? J/(kg · °C)(b) Which substance listed in the specific heat and molar specific heat table best matches the specific heat of this unknown material? mercurysilver    brassgraniteglassaluminumwoodseawater

Older railroad tracks in the U.S. are made of Part A 12-m-long pieces of steel. When the tracks are laid, gaps are left between the sections to prevent buckling when the steel thermally expands. If a track is laid at 16° C, how large should the gaps be if the track is not to buckle when the temperature is as high as 50° C? The coefficient of linear expansion of soft steel is 1.1 × 10-5 °C-1. Express your answer with the appropriate units. HẢ .... Value %3D Submit Previous Answers Request Answer

Week 4 #18 A copper bar of thermal conductivity 401 W/(m·K) has one end at 114°C and the other end at 24.0°C. The length of the bar is 0.110 m, and the cross-sectional area is 1.00 × 10−6 m2. If two such bars were placed in series (end to end) between the same constant-temperature baths, what would the rate of heat conduction  ? be? ______W

During an all-night cram session, a student heats up a 0.304 liter (0.304 x 10- 3 m3) glass (Pyrex) beaker of cold coffee. Initially, the temperature is 18.3 °C, and the beaker is filled to the brim. A short time later when the student returns, the temperature has risen to 96.9 °C. The coefficient of volume expansion of coffee is the same as that of water. How much coffee (in cubic meters) has spilled out of the beaker?