Q2: An engine absorbs 2.2 kJ from a hot reservoir at 254°C and expels 1.8 kJ to a cold reservoir at 29 °C in each cycle. What is the power output in (W) of the engine if each cycle lasts 0.2 s? Note: Answer will be in two decimal places

True or False? The second law of thermodynamics states that it is possible to have 100% efficiency for an engine as long as it is new.

A large electrical power station generates 1400 MW of electricity with an efficiency of 31 %. a) How much heat does the power station need to generate this amount of electricity in one day? Qn = b) How much heat is exhausted to the environment in one day? Qc = J c) The exhaust heat is transferred to the ambient air at 15 °C. What is the change in entropy of the surrounding air in one day? AS = J/K %3D d) The heat driving the generators is in the form of superheated steam at 260 °C. If a Carnot engine had been used instead, what would it's efficiency be? Efficiency = e) How much work was lost (left undone) because a Carnot engine was not used? WCarnot Wactual = %3D

An engine with an efficiency of 0.34 absorbs 55 J from a heat reservoir in each cycle. If it undergoes 221 cycles per minute, what is the power output in watts?

Give the numerical answers as numerical values of the requested units (number only) to three significant figures. If necessary, use a period as a decimal separator. Consider an ice cube with a mass of 331 g. Ice is initially 0.0°C degrees and melts at 0.0°C into degradable water. The melted water is heated to a temperature of 56.5°C. What is entropy change (J/K)?

Consider a heat engine transferring energy from a warm region (Tw) to a cool region (Tc) . Which combination of temperatures will result in the highest efficiency?   a. Tw = 500 K, Tc = 400 K   b. Tw = 500 K, Tc = 300 K   c. Tw = 500 K, Tc = 450 K   d. Tw = 300 K, Tc = 300 K

An engine absorbs 500 J of heat and reject 100 J of heat to cold reservoir in each cycle.  What is its efficiency? From the last question, how much work does the engine do in three cycles?

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.

An engine that absorbs 480 J of heat per cycle has an efficiency of 00.34. How much work W does the engine do in a cycle?

4. Suppose that a nuclear power plant has an efficiency of about 0.34, and generates 1000 MW of power. It is located on the banks of a major river that is 67 m wide near the plant, approximately 3 m deep, and flows at a rate of 0.5 m/s. Suppose that the plant re-routes all of this water into the plant and dumps its waste heat evenly throughout the water, then returns the warmer water to the river. How much warmer is the river downstream of the plant compared to upstream? Water's specific heat is approximately 4184 J/kg/K, and its density is 1000 kg/m³. [Answer: The water is warmer by 4.62 K. This is a lot warmer!]