Recent content by avistein

  1. A

    Formula for delta star in capacitors

    Homework Statement How to find out the equivalent capacitance using delta star conversion? Homework Equations Delta star conversion formula of capacitors The Attempt at a Solution Using the formula of resistors but not coming.What is the formula of delta star in capacitors?
  2. A

    Why anhydrous ZnCl2 is used in Groove's Process?

    Why anhydrous ZnCl2 is required for 1 degree alcohols to convert into alkyl halides? It is a SN2 reaction; so the weakening of C-OH bond can be done with H+ of HCl. Oxygen from the OH group can donate its lone pair to H+ and O develops a positive charge which weakens the C-OH bond.Then bond...
  3. A

    Find the integral rate equation of 1st order reaction

    ln[A0]/[A]=kt is the integrated rate equation for 1st order reaction.where A0 is intitial conc at time=0 and A is conc left after time =t .Here v1x has been used and [A0]-v1x is left.so that becomes ln[A0]/[A0]-v1x=kt?
  4. A

    Find the integral rate equation of 1st order reaction

    Homework Statement The reaction v1A+v2B--->Products is 1st order wrt A and 0 order wrt B.If the reaction is started with [A0] and [B0] find the integral rate equation. The Attempt at a Solution I have got ln[A0]/[A0]-v1x=kt but answer is given as ln[A0]/[A0]-v1x=v1kt.Which one is right?
  5. A

    Undergrad Why adiabatic process is required in heat engine?

    what is the need of adibatic process in heat engine? We can work only with isothermal process .Please expalin this.
    • avistein
    • Thread
    • Adiabatic Adiabatic process Engine Heat Heat engine Process
    • Replies: 3
    • Forum: Thermodynamics
  6. A

    Undergrad Reversed Carnot Cycle: Explained for Refrigerators

    What happens in a reversed carnot cycle? I mean in refrigerators.The gas is adiabatically compressed so that it's temperature rises.Then it is isothermally compressed so that the heat is rejected to the sink.But then why it is said everywhere that the working substance absorbs heat from sink...
  7. A

    Undergrad Is the efficiency of heat engine more in hilly areas than in plains?

    In hilly areas temp is low than plain areas.So the temperature of source as well as sink must be low.But ratio remains same.So efficiency is same as in plain areas? Is my logic correct? Or anything else? Can it be more?
  8. A

    Undergrad Why is Entropy Highest at Lowest Energy?

    ok.I mean to say that why entropy is highest at equilibrium?
  9. A

    Find the upward acceleration of the man

    But here in the man+platform problem,how can we consider that the force applied by the man has no acceleration? then only we can write T-mg/2=0=>T=mg/2
  10. A

    Find the upward acceleration of the man

    It's a typo.It should be "half his weight". But here in the man+platform problem,how can we consider that the force applied by the man has no acceleration? then only we can write T-mg/2=0=>T=mg/2 Suppose a pulley is there and one end has a mass and the other end has a force exerted by the...
  11. A

    Undergrad Why is Entropy Highest at Lowest Energy?

    I mean to say that more entropy relate to more stability.So more entropy relate to less energy. But how? more disorderness will relate to more energy.
  12. A

    Undergrad Kirchhoff's Law: Detailed Mathematical Deduction (Proof)

    Hope this helps you.Detailed derivation.
  13. A

    Undergrad Why is Entropy Highest at Lowest Energy?

    Why entropy is highest at lowest energy? Entropy is disorderness.So low energy means low disorderness.But why it is highest?
  14. A

    Find the upward acceleration of the man

    We can consider the force exerted by the man is same as the weight hanging from one end.right?
  15. A

    Find the upward acceleration of the man

    But here also the other end has some mass(mass of man+platform).And why in this case we are considering that the system is at rest?