Why is heat usually the last thing determined when using a PV diagram?
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Why is heat usually the last thing determined when using a PV diagram?
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- How much natural gas do you need to burn to heat 20 liters of water from 0 degrees C to 30 degrees CHow much natural gas do you need to burn to heat twenty liters of water from 0 degrees C to 30 degrees C?It describes the process between the combustion furnace, the boiler and the preheater, I do not need calculations, only explanation.
- It is a heat transfer question. Please briefly explain.3.simple presentation of Nuclear Power PlantMaterial A with initial temperature of 80 ⁰C came into contact with material B with initial temperature of 15 ⁰C. What are the scenario/s that would likely to happen?Temperature of material B will be above 80 ⁰CEntropy of material A will increaseEnergy transfer is from material B to material ATemperature of material A will be below 15 ⁰CA.) If all 4 statements are trueB.) If 3 of the 4 statements are trueC.) If 2 of the 4 statements are trueD.) If only 1 of the 4 statements is trueE.) If none of the 4 statements is true
- What is dynamic equilibriumWhy the energy that we feel from the sun is mostly radiation? A) It depends on the distance between the Sun and the Earth B) Due to lower thermal conductivity value of the air c) Due to the nuclear reactions inside the sun D) Not sufficient informationWhy was diameter used instead of area in the equivalency equation?
- Which of the following has the lowest calorific value ? I) coal ii) charcoal iii) wood iv) keroseneQUESTION TWO (a) Consider the process of heating water on top of an electric range.i. What are the forms of energy involved during this process?ii. What are the energy transformations that take place?(b) A classroom that normally contains 40 people is to be air-conditioned with window air-conditioning units of 5-kW cooling capacity. A person at rest may be assumed to dissipate heat at a rate of about 360 kJ/h. There are 10 light bulbs in the room, each with a rating of 100 W. The rate of heat transfer to the classroom through the walls and the windows is estimated to be 15,000 kJ/h. If the room air is to be maintained at a constant temperature of 21°C, determine the number of window air-conditioning unitsrequired.(c) Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at 20°C, whereas system B contains 200 kJ of thermal energy at 50°C. Now the systems are brought into contact with each other. Determine the direction of any heat transfer between the two…Water melts as temp increases because : - chemical potential of the liquid is lower than that of gas - liquid and solid form eutectic mixture -chemical potential of the liquid and solid become equal