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  1. U

    Physics: Post your doubts here!

    is it option B? it is moving at constant speed. so forward force = backward force forward force = (1 x 10^3)sin30 work = f*d (1x10^3)sin30 * 5 = 2.5 x 10^3
  2. U

    Physics: Post your doubts here!

    in parallel circuits, voltage is the same in every branch so v2 = v3 total voltage will be v1 + v2 = v or v1 + v3 = v v - v1 = v3
  3. U

    Physics: Post your doubts here!

    i am really sorry. i replied to the question before but i stated the wrong formula. the correct ans is f = change in momentum / change in time f = (p1 - p2) / (t2 - t1)
  4. U

    Fee strucute for A level

    isnt it rs 7685 for As level for private candidates???
  5. U

    Physics: Post your doubts here!

    it is given in the question 'the sphere of radius R.....' and the equation stated above is of a sphere and we are using the same equation in the calculation 4 rain drop. so it can not be cone or hemisphere or anything else
  6. U

    Physics: Post your doubts here!

    a) newton=D*metre*metre/second newton = kgm/(s^2) d*m*m/s = kgm/(s^2) d=kg(m^-1)(s^-2) b)i) f = 6(pie) * 6.6 x 10^-4 * 1.5 x 10^-3 * 3.7 f = 6.9 x 10^-5 ii) f = ma f = 6.9 x 10^-5 m = density*volume m = 1000*[(4*pie*r^3)/3] m = 1.4 x 10^-5 a = 4.88 m/s^2
  7. U

    Physics: Post your doubts here!

    june '07 q10) force = momentum*time means area under graph f = [p1 + (-p2)] / (t2 - t1) f = (p1 - p2) / (t2 - t1)
  8. U

    Physics: Post your doubts here!

    june '05 q13) moments = force*perpendicular distance 5N and 10N force have anticlockwise moments. (5*2) + (10*2) = 30 N 20N force is clockwise. (20*3) = 60N resultant = 60 - 30 = 30N
  9. U

    Best A LEVEL MATHS TEACHER/CENTER IN KARACHI??

    sir asif qureshi is also gud. i studied As from him and now studyin A2. in my opinion he is a gud teacher... if u want his contact number i can give it to u
  10. U

    Mathematics: Post your doubts here!

    :P
  11. U

    Physics: Post your doubts here!

    thn what is emf??? :unsure:
  12. U

    Mathematics: Post your doubts here!

    value of R is 5 for least value, we substitute the value [cos(theta + alpha)] with +1 and -1 so function will be 5(1) + 7 and 5(-1) + 7 so the least value is 2
  13. U

    Physics: Post your doubts here!

    is emf voltage? if it is voltage, emf is w/q
  14. U

    Physics: Post your doubts here!

    as shown...
  15. U

    Physics: Post your doubts here!

    anticlockwise moments = clockwise moments assume the distance as 'x' 1 distance will b x metres the other will b (1-x) metres 360 * x = 240 * (1-x) 360x = 240 - 240x 600x = 240 x = 0.4 metres as we have to find the center of gravity from the midpoint, it will be 0.5 - x = 0.1 metres to the left
  16. U

    Physics: Post your doubts here!

    option E means what??? whats the numerical value? m getting 0.4. is it ryt?
  17. U

    Physics: Post your doubts here!

    ur welcum again :)
  18. U

    Physics: Post your doubts here!

    q21) momentum = force * time that means area under graph is momentum divide the graph in 2 sections 1st division from 0 to 2 seconds, 2nd division from 2 to 6 seconds area of 1st division : 2*2 = 4 area of 2nd division : 1/2*(4)(2+6) = 16 total area = momentum = 20
  19. U

    Petroleum Engineering

    best of luck
  20. U

    Physics: Post your doubts here!

    ur welcum :)
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