Recent content by abs123456

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    Thermodynamics question, entropy Example

    how do u work out delta q?
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    Master the Lever Rule: Tips and Tricks for Understanding this Important Concept

    Could someone please help me on this question. I do not really understand how to use the lever rule. Attactched is an example.. Thanks very much
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    Intersection points of the planes

    Homework Statement Find all the intersection points of the planes: 2x-y-z=3 x+2y+3z= 7 Homework Equations Whats the best n most simplest way to go about this question. Thanks The Attempt at a Solution
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    Fluids, finding the density of a sphere in oil Please help

    Homework Statement A small sphere (diameter = 10 mm) is left to fall in a fluid (oil, SAEIOW) at 200 degrees with a constant velocity of 50 mm/s.. The Following data is available: - For SAEIOW oil at 20 degrees: p = 920 kg/m3, μ = 0.1 Pa.s a) The drag force on the sphere b) The...
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    Pressure at a point in a fluid

    Homework Statement DEFINE PRESSURE AT A POINT IN A FLUID AND SHOW THAT IT IS A SCALOR QUANTITY? Homework Equations I saw this in a recent paper and i am not too sure about how i should go about doing it.. Its a 7 mark question.. Any Ideas? The Attempt at a Solution
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    Thermodynamics question, entropy Example

    Thanks for the replys, however when i am doing the entropy balance i seem to be getting it wrong... Do i use this equation : S= M x Cp x ΔT... for both waters and then take their differnece? I get a different answer though, it should be 2.02kj/k
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    Electricity current question , nodes

    So do i have to split the circuit into 3 individual ones?
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    Electricity current question , nodes

    Hi mate, i didnt want the answer, just some advice/tips on how i should go about doing this question
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    Electricity current question , nodes

    Homework Statement 1. For the circuit shown in Figure Q1 calculate: (i) The magnitude and direction of the current that flows through Rl , (H) The magnitude and direction of the current that flows through RS. (iii) The potential difference between nodes Q and R (iv) An equivalent circuit...
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    Thermodynamics question, entropy Example

    Homework Statement A well insulated container of negligible thermal capacity contains 30 kg of water at 90oc. A mixing process then takes place in which 50 kg of liquid water at 17oc is added to the tank. The mixing process is continued until thermal equilibrium is established...
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    Torque and viscosity relations, fluid mechanics

    A uniform film of oil 0.13 mm thick separates two circular discs, each 150 mm diameter and mounted coaxially. Find the torque required to rotate one disc relative to the other at a steady speed of 400 rev/min if the oil has a viscosity of 0.14 Pa.s. (Ignore edge effects at the rim of the...