After finishing your specific heat lab you have been asked the following: A hot object loses heat to its surrounding by a process called heat radiation. Rate of this process depends on O temperature of the surrounding O temperature difference between the object and surrounding O temperature of the object O average temperature of the object and surrounding

4) A ground source heat pump heats a building by extracting heat from the ground and pumping it into the building. Define: Qc = heat extracted from the ground, Qn= heat pumped into the building, W = electric energy used by the heat pump, Tc= temperature of the ground, T = temperature of building (Qc, Qn, and W are positive by definition). Assume Tr > Tc. a) Draw a diagram showing energy flow in and out of the heat pump. b) Write a general expression for the change AS in the entropy of the "universe", that is the heat pump plus the cold and hot reservoirs, in terms of the quantities defined above. Now assume ideal (reversible) operation, and take Te= 10 °C and Tp= 20 °C. What is the coefficient of performance (ČOP) of the heat pump? By what factor would this change if we had Tc = 0 °C instead?

In the table below for E106, which of the following is the amount of heat lost by the metal specimen when dropped in the calorimeter with water? TRIAL 1 Determining the Specific Heat of Metal Specimen Metal Specimen 1 Mass of calorimeter, me Mass of calorimeter with water Mass of water, mi Mass of metal specimen, mm Initial temperature of metal, tom Initial temperature of calorimeter, toc Initial temperature of water, tow Final temperature of the mixture, tmix Specific Heat of Water cw Specific Heat of calorimeter ce Experimental specific heat of metal, cm Actual specific heat of metal, cm Percentage Error O 699 cal O 212 cal O 675 cal O 488 cal 150.0 g 225.0 g 8 100.0 g 100°C 20.0°C 20.0°C 26.5°C 1.0000 çal/gC 0.2174 cal/gC cal/gC 0.0917 cal/gC %

A block has a temperature of 277 K. Heat could spontaneously flow from which of the following objects to the block? Choose all that apply. a) A counter top at 357 K b) A carpet at 177 K c) A rug at 324 K d) A wall at 246 K e) A brick at 361 K f) A board at 106 K g) A table 366 K h) A shelf at 277 K