• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Search results

  1. U

    Physics: Post your doubts here!

    a) 20 oscillations in 6.5 s 1 oscillation in 0.325s time period = 0.325s angular frequency = 2pie/time = 2pie/0.325 = 19.33 rad/seconds b) maximum speed = ang.frequency*max.amplitude = 19.33*(35*10^-3) = 0.67 m/s c) max acceleration = [(ang.frequency)^2]*max.amplitude = (19.33^2)*(35*10^-3) =...
  2. U

    I need you help dear brothers and sisters

    if u give proper time to each subject, 4 months are enough....
  3. U

    Mathematics: Post your doubts here!

    ur welcum :)
  4. U

    Mathematics: Post your doubts here!

    value of a=3 so x^2 + 3x + 1 = 0 x^2 - 3x - 1 = 0 x = [-b +- (b^2 - 4ac)^0.5] / 2a x = [-b +- (b^2 - 4ac)^0.5] / 2a x = {-3 +- [(3)^2 - 4(1)(1)]^0.5} / 2(1) x =...
  5. U

    Mathematics: Post your doubts here!

    ans3) dy/dx = gradient at that point, gradient is = 3/[1+2(1)]^2 = 1/3 equation is: y-y1=m(x-x1) y - 1/2 = 1/3 (x - 1) 3y - 3/2 = x - 1 3y = x + 1/2
  6. U

    Mathematics: Post your doubts here!

    thanku :)
  7. U

    Physics: Post your doubts here!

    ur welcum :)
  8. U

    Mathematics: Post your doubts here!

    umm thanku but i m girl
  9. U

    Mathematics: Post your doubts here!

    jus bring the denominator in the numerator with negative power. and diffrentiate as u diffrentiate power and bracket as i stated above...
  10. U

    Mathematics: Post your doubts here!

    isnt it the same value as the value of b in part 1? b,c are the turning points of the graph.. the line of symmetry is made at point b vertically
  11. U

    Mathematics: Post your doubts here!

    markscheme says -6(2x+3)^-2 *2
  12. U

    Mathematics: Post your doubts here!

    whenever we diffrenciate, first we diffrenciate the power as u did, thn we diffrenciate the term in the bracket
  13. U

    Mathematics: Post your doubts here!

    f(x)= 6 (2x+3)^-1 f'(x) = -6 (2x+3)^-2 (2+0) -12/(2x+3)^2 -[12/(2x+3)^2] whatever the value of x, whether negative or positive, the whole square will make the entire bracket value positive. but the negative sign will always make the answer negative so f(x) is always a decreasing function.
  14. U

    Physics: Post your doubts here!

    1. v = ir 3 cells so v = 4.5 v 4.5 = 0.27 * r r = 16.66 ohms this is total resistance r = 15 + internal resistance*3 1.66 = 3x x = 0.55 ohms 2. v = ir 1.5 = 0.5 * i i = 3 A current divides in parallel n remains same in series so max current in series circuit. p = vi p = 3*1.5 p = 4.5 W
  15. U

    Physics: Post your doubts here!

    g is directly proportional to 1/r^2 at poles, radius is minimum so g will b maximum while at equator, radius is max to g will b minimum.
  16. U

    Physics: Post your doubts here!

    4c) the initial speed is all horizontal. the horizontal component of speed remains constant through out the motion. so the horizontal speed is 18m/s
  17. U

    Physics: Post your doubts here!

    is it D? momentum change = m * change in velocity initial velocity is = u final is = -u (-ve sign is due to direction change) change is [u-(-u)] change is 2u momentum change is 2mu
  18. U

    challange!! 80% of people failed

    R = square root of [(1^2) + (sqr rt of 3)^2] R = 2 alpha = tan inverse [(square root of 3) / 1] alpha = pie/3 or 60 degrees 2[x-(pie/3)]
  19. U

    Physics: Post your doubts here!

    ur welcum :)
  20. U

    Physics: Post your doubts here!

    23. option D. it isnt B because option B states that the displacement is always zero. it is untrue as the displacement is just "instantaneously" zero.. when the wave will move forward there will be non-zero displacement. there is maximum acceleration and maximum force at maximum points.. so...
Top