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  1. M

    Physics: Post your doubts here!

    Q5) Use Loss in K.E = Gain in G.P.E (K.E at infinity is zero , G.P.E at infinity is zero) And you would get the equation.
  2. M

    Physics: Post your doubts here!

    Firstly you must know the formula for momentum. Momentum = Mass x Velocity p = mv a skateboard of mass 4kg is moving at a steady speed of 2m/s. Calculate its momentum. p = 4 x 2 = 8 kgms-1 A 1kg bag of sugr is then dropped vertically onto it. Calculate its new speed assuming momentum is...
  3. M

    Chemistry: Post your doubts here!

    snowbrood Grinard reagent is not in my syllabus, can't help. Firstly, find charge. Q = It = 2 x 1830 = 3660 C Secondly, find amount of electrons Amount of electrons = Q/96500 = 3660/96500 = 0.0379274611 mol Thirdly, construct the Oxidation half equation 2H2O --> O2 + 4H+ + 4e Next, find...
  4. M

    Chemistry: Post your doubts here!

    Assuming the volume of the mixture does not change after addition of CuSO4. Heat absorbed = mc DeltaT = 100 x 4.18 x 2.9 = 1212.2J Amount of CuSO4 = 25/159.6 = 0.156641604 mol Enthalpy change of solution of CuSO4 = Heat absorbed / Amount of CuSO4 = +1212.2 / 0.156641604 =+7738.6848 Jmol-1...
  5. M

    Chemistry: Post your doubts here!

    Q8) A 2 g sample of hydrogen at temperature T and of volume V exerts a pressure p. Deuterium, 2/1 H, is an isotope of hydrogen. Which of the following would also exert a pressure p at the same temperature T ? A 2g of deuterium of volume V B 4g of deuterium of volume V/2 C a mixture of 1 g of...
  6. M

    Physics: Post your doubts here!

    Energy of photon = work function of a metal + Maximum kinetic energy of the electron E = Φ + K.E hc/λ = Φ + K.E Where c is the speed of light ( 3 x 10^8 m/s) --------------------------------------------------- A surface is eradiated with lights of wavelength 5.5 x 10^-7m and electrons are...
  7. M

    Chemistry: Post your doubts here!

    OH is a bond at the alcohol molecule OH- is an ion from a alkali (eg. NaOH)
  8. M

    Physics: Post your doubts here!

    Q6) Uniform circular motion The acceleration acts perpendicularly to the direction of travel Q16) A Potential energy decrease. There is no work done from bringing the positive charge vertically. Q21) A Deviation of hydrostatic pressure P = F/A Where Force is the weight of the liquid = mass x...
  9. M

    Chemistry: Post your doubts here!

    Q2) B 1 of the side chain - 1 double bond gets saturated 2 of the side chain - 2 double bond gets saturated x 2 = total of 4 double bond saturated 1+4 = 5 Q6) C Ideal gas equation work best for gases at High temperature and Low pressure Q8) A Q11) A There is higher % of dissociation of H+...
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