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Thread: My study questions

  1. #1 My study questions 
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    I have some study questions which i may like u good people to help me solve. i will be writing an exams on it nest week monday.
    They are question from Heat Transfer and Thermodynamics Respectively. i will be happy if every one will just solve one for me cos i have a lot to cover on other areas and the study questions are likely to reflect in the exams.

    1. Show that Cp-Cv=R where R=Universal gas constant.
    2. Show that for an ideal gas undergoing an adiabatic process, PVr=a constant, where r =Cp/Cv
    3. Compute the entropy change of a system consisting of 1.00kg of ice at 0oC which melts (reversibly) to water at thesame temperature. The latent heat of melting is 79.cal/g.
    4. What factors reduce the efficiency of heat engine from its idea value?
    5. An ideal has engine operates in a Carnot cycle between 227 and 1270C. it absorbs 6.0 x 104 cal at the higher temperature. How much work percycle is this engine capable of performing?
    6. In a mechanical refrigerator, the low-temperature coils are at a temperature of -130C, and the compressed gas in the condenser has a temperature of 270C. What is the theoretical coefficient of performance?
    7. In a heat pump, heat from the outdoors at -50C is transfered to a room at 170C, energy being supplied by an electric motor. How many joules of heat will be delivered to the room for each joule of electric energy consumed, ideally?
    8. At atmospheric pressure, 1.00g of water having a volume of 1.00cm3 becomes 1671cm3 of steam when boiled. The heat of vaporization of water is 539cal/gm at 1atm. Calculate; a. The amount of heat added to the system from the environment b. The work done by the system on the environment. c. The internal energy change of the system.
    9. Find the internal energy of a system during each of the following processes; a. A system aabsorbs 500cal of heat and at the same time does 400j of works. b. A system absorbs 300cal and at thesame time 420j of work is done on it. c. 1200 cal is removed from a gas held at constant volume, give your answer in kilojoules
    10. The Specific heat of water is 4184j/kgK. By how many joules does the internal energy of 50g of water change as it is heated from 210C to 370C? Assume that the exapansion of the water is negligible.
    11. In a certain process, 8.00Kcal of heat is furnished to the system while the system does 6.00kj of work. by how much does the internal energy of the system change during the process?
    12. Two Metal plates of same area A=80cm3 are soldered together. their thickness are L1 = L2 =3.00mm, T1 = 1000C, T2 = 00C. Where their thermal conductivity are K1 = 48.1 W/m.K T and k2 = 68.2 W/m.K . Find the heat flow rate through the plates and the temperature T of the soldered junction.

    Please help your brother ooo.


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  3. #2  
    Universal Mind John Galt's Avatar
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    So, you want us to do your homework for you. Are you familiar with the aerodynamics of porcine quadrupeds?

    There are two reasons that members here will not do this for you:

    Reason 1: They are genuinely concerned for your future and know that only an ephemeral benefit will accrue to doing your work for you. They realise that it will be far better for you to do this homework yourself, or - indeed - to face the consequences of not completing it in time. In the real world you don't survive long leaching off of other people's efforts. These members will be ready to help you if you show you have made a genuine effort to do the work, but need help over a small stumbling block.

    Reason 2: They have absolutely no intention of giving any assistance to someone so lazy that they cannot be bothered to get of their fat ass and do a little bit of work for their own benefit and who, in addition, is so damnably arrogant that they think complete strangers will drop everything to help them do their own work.

    Anyone who does apparently help may belong to either of the first two categories, but will provide you with incorrect answers.

    Now, if you wold like to submit your answers to the above here, I am sure there are members who will be happy to check it for you.


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  4. #3  
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    Quote Originally Posted by John Galt View Post
    So, you want us to do your homework for you. Are you familiar with the aerodynamics of porcine quadrupeds?There are two reasons that members here will not do this for you:Reason 1: They are genuinely concerned for your future and know that only an ephemeral benefit will accrue to doing your work for you. They realise that it will be far better for you to do this homework yourself, or - indeed - to face the consequences of not completing it in time. In the real world you don't survive long leaching off of other people's efforts. These members will be ready to help you if you show you have made a genuine effort to do the work, but need help over a small stumbling block.Reason 2: They have absolutely no intention of giving any assistance to someone so lazy that they cannot be bothered to get of their fat ass and do a little bit of work for their own benefit and who, in addition, is so damnably arrogant that they think complete strangers will drop everything to help them do their own work.Anyone who does apparently help may belong to either of the first two categories, but will provide you with incorrect answers.Now, if you wold like to submit your answers to the above here, I am sure there are members who will be happy to check it for you.
    John Galt;590472]You shouldn't have dropped these insulting words of yours first, your should have seek to know whether i have tried doing them or not because you dont know the situation i was in before i seek for help from you (thescienceforum). I not that i want you guys to do my homework for me. I posted that when i got it from a mate of mine and i have also gone home to look into it and i equally done some.All thesame am happy u have expressed your mind and feeling about the whole stuffs. but am not lazy as you said.When i get home i will drop my solutions to the once i have solved that i still have doubt. Thanks.
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  5. #4 The questions i have problem with 
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    Two Metal plates of same area A=80cm3 are soldered together. their thickness are L1 = L2 =3.00mm, T1 = 1000C, T2 = 00C. Where their thermal conductivity are K1 = 48.1 W/m.K T and k2 = 68.2 W/m.K . Find the heat flow rate through the plates and the temperature T of the soldered junction.H = KA (T2-T1)/L2-L2That is what am using but i still doubt my usage of those variables there. Dont just know the right formula to apply
    Last edited by webconnector; September 5th, 2014 at 02:10 AM. Reason: made a mistake
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