Change of phase occurs at a constant temperature, which implies that even on addition of heat to a substance temperature remains constant. True or False? a) True b) False
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Change of phase occurs at a constant temperature, which implies that even on addition of heat to a substance temperature remains constant. True or False?
a) True
b) False
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- Required information In an emergency, it is sometimes the practice of medical professionals to immerse a patient who suffers from heat stroke in an ice bath, a mixture of ice and water in equilibrium at 0°C, in order to reduce her body temperature. The average specific heat of human tissue at 20.0°C is 3.50 x 103 J/kg-K. The latent heat of fusion for water is 333.7 x 10 J/kg. A(n) 85.1-kg patient whose body temperature is 43.5°C was reduced to 37.0°C. If she is placed in a bath containing 5.70 kg of ice, what will be the ice remaining in the bath when her body temperature is 37.O°C? kg4) 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?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
- Problem 6: Suppose you pour 0.0125 kg of 20.0°C water onto a 1.1-kg block of ice, sitting in a large bowl, which is initially at -15.0°C. The latent heat of fusion for water is Lf = 334 kJ/kg. What is the final temperature of this system? You may assume that the water cools so rapidly that effects of the surroundings are negligible.Homework 3: Problem 9: An electric coffeemaker has a 790-W heating element. The specific heat of water is 4.19 × 103 J/(kg⋅°C). How long, in seconds, does it take the coffeemaker to heat 0.57 L of water from 18°C to 95°C, assuming all the heat produced by the heating element goes into the water? Δt = ______Two objects made of the same material have different masses and temperatures. If the objects are put in thermal contact and allowed to come to thermal equilibrium, which one will experience the larger temperature change? a) The one with the higher initial temperature b) The one with the lower initial temperature c) The one with the larger mass d) The one with the smaller mass e) They will have equal temperature changes, one getting hotter, one colder.