11 kg of steel has an original temperature of 210°C. If gains heat to the value of 710 kJ, what is the final temperature in °C? Specific heat of steel is 450 J/kg K. The final temperature in °C
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- Problems 1. An iron casting of mass 10 kg has an original temperature of 200°C. If the casting loses heat to the value of 715.5 kJ, what is the final temperature? Take C=477J/kgK. Ans:323K1. A 700-g metal alloy is initially at 500˚C, then it was cooled to 50˚C. Take 0.25 cal/gC˚ to be the specific heat of the alloy. How much heat is removed from the metal?A sample of water that is initially at 84.00C absorbs 500 kcal of heat. As a result, the liquid water becomes water vapor at 1150C. What is the mass of the water? (Some useful information: cwater = 1 cal/g0C, Lv,water = 540 cal/g, and csteam = 0.480 cal/g0 C. a. 488 g b. 788 g c. 588 g d. 888 g e. 688 g
- 1- Suppose you are operating a steam turbine where the steam leaving the turbine is at 5 bar. This steam contains 95 wt% vapors. If the shaft work produced by the turbine is 1100 kJ/kg and the high pressure, high temperature steam enters the turbine at 100 bar (abs), what is the temperature of the steam entering the turbine? If water at 10°C is supplied to the steam boiler to generate steam, how much heat is required per kilogram of steam produced? You may assume that heat losses from the turbine are negligible.5. A gas cylinder of volume 'V' and radius 'r' contains 1.00 mol He at a pressure PHe and 1.00 mol Ar at a pressure of PAr, and both are at a temperature T = 298.0K. At the top of the cylinder is a disc with a radius 'r' that is permeable to He but not Ar. The disc is pushed to the half volume mark. 1. How much work is required for this process to be conducted isothermally and reversibly? 2. How much does AG, AH and AS change for this process? Semi-permeable disc Ar Ar Не Не Volume = V V/2 V/2THERMODYNAMICS UPVOTE WILL BE GIVEN. PLEASE WRITE THE COMPLETE SOLUTIONS. NO LONG EXPLANATION NEEDED. BOX THE FINAL ANSWER AND USE 3 DECIMAL PLACES. A gas, whose composition is not known, has 40 BTU of paddle-work input at a constant volume of 20 ft3 from 20 psia and 80°F to 180°F. What are change of internal energy and heat if k =1.21? (ANS: 65.3, 25.3BTU)
- 3. According to Newton's cooling law, the rate of cooling of a hot body is pro- portional to the difference between the temperatures of the hot body and the environment. If the room temperature is 35°C and the temperature of a hot body in the room cools down to 55°C from 105°C Celsius in just 6 minutes, then how many more minutes will it take to cool down to 45°C?30. A cylinder contains an amount of gas. At pressure of 470 kPa and at temperature of 27 ̊C, thegas occupies a volume of 0.03 m3. It is then compressed according to Boyle’s law until its pressureis 1.3 MPa, and then expanded according to Charles’ Law until its volume is 0.02 m3. Calculate thefinal temperature of the gas. a. 292.35000C b. 248.85000C c. 216.22500C d. 280.31810CA piston-cylinder device contains a gas initially at 8 Bar and 0.030 m2. It expands at constant temperature to a final volume of 0.060 m3. What is the value of work done in KI? Select one: O a. 16635 O b. 166.35 O C. 1663.5 O d. 16.635
- 30. A cylinder contains an amount of gas. At pressure of 470 kPa and at temperature of 27°C, the gas occupies a volume of 0.03 m³. It is then compressed according to Boyle's law until its pressure is 1.3 MPa, and then expanded according to Charles' Law until its volume is 0.02 m³. Calculate the final temperature of the gas. a. 292.3500°C b. 248.8500°C c. 216.2250°C d. 280.3181°CSECOND LAW OF THERMODYNAMICS write your soln. complete. draw a sketch and explain if necessesary THANK YOU! answer it in 1hrQ1. The following data is obtained during geothermal drilling operation. Rock density = 1550 kg/m ³, heat capacity of the rock = 0.00163 J/kg K, temperature difference = 80 K. How much will be the thermal heat content of the rock at the geothermal site? Discuss about geothermal gradients their importance in energy exploration. Do you think utilization of geothermal energy worldwide is increasing yearly? Justify your answer. Do you think the geothermal energy available in this site can be used for a metal melting industry?