Consider applying our Carnot heat engine approach to a biological system, specifically, a hunting cheetah. The work output may be considered to be the kinetic energy change as the 45 kg cheetah accelerates from rest to 27 m/s. The heat input, Qu. may be considered to come from the digestion of meat. The outside temperature is 30°C and the cheetah's internal temperature from which the Qu comes from is 42°C. Determine b. the heat that must be rejected c. the kilograms of meat that must be digested if 200 kJ of heat is released for every kilogram of meat digested

A claim states that a heat pump has been invented that requires work to be done on the system of 400kJ and delivers energy to its surrounding by heat transfer of 300kJ. Such device is possible True False

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During one cycle the working fluid in an engine engages in two work interactions: 15 kJ to the fluid and 44 kJ from the fluid, and three heat interactions, two of which are known: 75 kJ to the fluid and 40 kJ from the fluid. What is the magnitude and direction of the work? What is the magnitude and direction of the third heat transfer? State the formula we used. Solutions/answer must be accurate.

This question deals with a cylinder, which is upright. Here are the facts for the problem. Can you please help me with a clear diagram and then the right equations for net work and heat? There is a massless and frictionless piston inside the cylinder with two stops which prevent movement down the cylinder. But, the cylinder can still move upward. Under the Below the piston is 5 kg of water, 50% of which (by mass) is initially vapor at 120°C. Heat is gradually added to the water until the water reaches a final state of 400°C. The atmospheric pressure is 500 kPa. The stops don't affect the area.  (1) Draw a P-V diagram for the process, which includes the isotherms at states 1 and 2.  (2) A what temperature does the piston first lift off? At what temperature has the liquid turned to vapor? (3) What is the net work and heat transfer between the system and the surrondings between states 1 and 2. Are these transfers going into or out of the system?

Provide clear/complete (step by step ) solution as well as a diagram for this problem.  The thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heatis supplied to it at a rate of 60 MW is: A. 33.3%       B. 50%     C. 66.7%          D. 75% Answer: C

Thermodynamics question

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... .. Two Carnot refrigeration A and B operate in series. The refrigerator A absorbs energy at rate Q1(kJ/s) from a body at temperature 300K, and reject energy as heat to a body at temperature T. The refrigerator B absorbs the same quantity of energy which is rejected by refrigerator A from a body at temperature T, and rejects energy as heat to a body at temperature 1200K. If both refrigerators have the same C.O.P, then work input to refrigerator A is 1.5Q1 O Other O 1.4Q1 O 1.1Q1 O 1.3Q1 O

In the following problem, consider the human body as a heat engine with efficiency e = 0.2 that can take in energy as food Qh, perform work W, and generate heat Qc. This heat expelled from our muscles (Qc) is an important component of maintaining a constant body temperature, which necessitates a balance of energy intake and output. In order to calculate the energy intake Qh, you will use the table above listing activity factors for selected activities, for a person with a BMR of 1440 kcal/day. For example, the energy required to stand per hour would be (fstand)(BMR) = (1.7)(1440 kcal/day) (1day/24 hours) = 102 kcal/h. For each scenario, calculate the 24 h number of bowls of cereal that must be consumed per hour (1 bowl = 100 kcal) to perform the required activity (Qh) Determine whether you have an energy deficit or surplus by considering the heat generated by your muscles (Qc), the heat loss from conduction, and the heat loss/gain from radiation We will consider heat loss from…