d water are at 25.6 °C. To make a cup of coffee, a small electric heater is immersed in the water and brings it to a boil in two minutes. sume that the cup and water always have the same temperature and determine the minimum power rating of this heater. umber Units

Assume that Q₁ = -15.0 J and Q2 = -80.0 J in (Figure 1). For help with math skills, you may want to review: Substituting Numbers into Mathematical Expressions For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Heat engine details. Figure p (kPa) 400 200 0- 0 100 200 22 1 of 1 - V (cm³) Part B What is QH for the heat engine shown in the figure? Express your answer with the appropriate units. QH = 125 J Submit Part C Correct n = Previous Answers What is the thermal efficiency for the heat engine shown in the figure? Submit - ΑΣΦ Request Answer ?

3) Consider a system consisting of one particle with two states, one of energy 0 and one of energy +ɛ. a) Write down the partition function Z for this system. b) Show that the average energy for this system can be written as

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A heat engine provides a net power output of 14 kW and has an efficiency of 23 %. The engine rejects 1200 J of energy per cycle to a low temperature reservoir. a)Determine the amount of heat delivered to the engine from the high temperature reservoir per second. Your answer should be in units of Watts.  b)Determine the required number of cycles per minute executed.

Please state if each question is True or False; if False, please explain why

In1816, Robert Stirling, a Scottish clergyman , patented the Stirling engine which has found a wide variety of applications ever since, including current use in solar energy collectors to transform sunlight into electricity. Fuel is burned externally to warm one of the engine's two cylinders, A fixed quantity of inert gas moves cyclically between the cylinders, expanding in the hot one and contracting in the cold one. Figure P21.33 represents a model for its thermodynamic cycle. Consider n moles of an ideal monoatomic gas being taken once through the cycle, consisting of two isothermal processes at temperatures 3Tiand Ti and two constant-volume processes. Let us find the efficiency of this engine .(a) Find the energy transferred by heat into gas during the isovolumetric process AB. (b) Find the energy transferred by heat into the gas during the isothermal process BC. (c) Find the energy transferred by heat into the gas during isovolumetric process CD. (d) Find the enrgy transferred by…

When 2.1 kg of water at 12.3 °C is mixed with 3.7 kg of water at 39.7 °C in a well-insulated container, what is the change in entropy of the system? Part A Make an estimate. Express your answer to two significant figures and include the appropriate units. HÁ ? AS = Value Units Submit Request Answer Part B Use the integral AS = [dQ/T. Express your answer to two significant figures and include the appropriate units. HA AS = Value Units Submit Request Answer

em 5 A NATO base in northern Norway is warmed with a heat pump that uses 7.0°C ocean water as the cold reservoir, Heat extracted from the ocean water warms fluid to 80° C; this warmed fluid is used to heat the building When the system is working at full capacity, 2000 kW of heat are delivered to the building at the cost of 600 kW of electric energy. Part A What is the actual coefficient of performance of the system? COP Submit Request Answer Part B What is the theoretical maximum coefficient of performance of the system? COPX Submit Request Answar P Type here to search

A heat engine takes in 14 kJ of energy and rejects 6 kJ to a low temperature sink. 1. How much work does the engine produce?  2. What is the efficiency of the heat engine?