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  1. U

    A2 Physics | Post your doubts here

    june 04 q8) the binding energies of uranium barium and krypton are used. we didnt use neutron's binding energy because neutron is a single particle and it does not have any binding energy
  2. U

    A2 Physics | Post your doubts here

    june 2004 q6) a)constant temp means no change in internal energy. gas is being compressed so work is done on the gas. according to the equation U = q+w change in internal energy is zero. work done is increased so "q" is decreased b) no expansion means constant volume. so work done is zero...
  3. U

    Physics: Post your doubts here!

    nov 2002 q3bii) the freq is 1/2fo so time will be 2T. means after twice of time period the oscillation will be forced. so every alternate oscillation is energized. and every pulse increases the amplitude. it is a resonance like process didnt i give u the ans before when u posted the same ques?
  4. U

    Mathematics: Post your doubts here!

    q) The diagram shows the curve y = x sin x, for 0 ≤ x ≤ π. The point Q (pie/2) , (pie/2) lies on the curve. (i) Show that the normal to the curve at Q passes through the point (π, 0). i got the normal but how to prove that it passes through the point (pie,0)?
  5. U

    Mathematics: Post your doubts here!

    yar itna kon sochta hai :p
  6. U

    Mathematics: Post your doubts here!

    kia baat hai apki... hum ques ko galat keh rahe hain n apne to solve bhi krdia :p
  7. U

    Mathematics: Post your doubts here!

    how can u do this ques when the vector equation is without a direction vector. A2 vectors always have direction vectors
  8. U

    Mathematics: Post your doubts here!

    A2 or As vectors?
  9. U

    Physics: Post your doubts here!

    if the mass in inc the force on balance is downwards and on wire is upwards. if mass is decreasing thn the force on balance is upwards and on wire is downwards
  10. U

    Physics: Post your doubts here!

    bii) B = F/(IL) I and L is given. force is mg m is given. B = mg/IL
  11. U

    Physics: Post your doubts here!

    bi) reading on balance is increasing which means force on balance is acting downwards. according to newton's third law, every action has an equal and opposite reaction. so the wire will have force upwards with the same magnitude. the direction of current in from X to Y and the force is upwards...
  12. U

    Physics: Post your doubts here!

    which part of q6?
  13. U

    Physics: Post your doubts here!

    the activity A0 is stated with 2% error. we hav to get the time for 10% ka error. means original se 8% error. if original is A0, then after 8% error, it will be 0.92A0. we will consider the expression: A = A0* e^(-lambda*time) lambda will be 0.693/half life lambda = 0.693/(5.27*365*24*3600) A =...
  14. U

    Mathematics: Post your doubts here!

    dV/dt = dV/dr * dr/dt (dV/dt will be taken in cm^3 because the radius is given in cm^3) vol of cylinder = pie * r^2 * h 1500 = pie * 20^2 * h h = 15/(4pie) V = pie * r^2 * 15/(4pie) pie cancels out dV/dr = 15r/2 1500 = 15*20/2 * dr/dt dr/dt = 10 cm/s
  15. U

    Physics: Post your doubts here!

    http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20(9702)/9702_w10_qp_22.pdf how to solve q4 part b
  16. U

    Physics: Post your doubts here!

    for a stationary wave, it is half wavelength. cox we need antinode at one end and node at other. first time it will be quarter wavelength. next time it will be 3/4 wavelength. so difference between the two will be half wavelength
  17. U

    Physics: Post your doubts here!

    it can be F.d sintheta. but the distance taken should always be perpendicular to the pivot. in this ques perp distance will be cos theta
  18. U

    Physics: Post your doubts here!

    nov 08 q27) it is a stationary wave. so there is half wave between 2 maximum. half wave is 15mm so full wave will be 30mm. v = f*lambda 3*10^8 = f * 30*10^-3 f = 1*10^10 option C
  19. U

    Physics: Post your doubts here!

    of may june 10 and 11, it is p11, 12 or 13?
  20. U

    Physics: Post your doubts here!

    june 06) q2: we have to remember the reasonable estimates. option D is correct cox the wavelength of visible light is in nanometres. 12) momentum before and after remains same. before collision it was: 3mv - 2mv = mv before = after mv = 4mv' where v' is the new speed m cancels out v' = v/4 14)...
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