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  1. U

    Save My Exams classified Answers (FREE)

    Yes plz. I want them for A2 Biology CIE specification and for A2 Chemistry CIE specification
  2. U

    Physics: Post your doubts here!

    W acts ats at centre of radius which is 0.20m. Now to lift Weight, you would need upward force. To provide that upward force, you would need torque o a couple as there are two forces acting in opposite directions but you only require one of them to act in direction opposing the Weight (ACWM).
  3. U

    Physics: Post your doubts here!

    its A. Since pipe open at both ends 1st Harmonic occurs where 0.5lamda=L. 2nd Harmonic occurs where lamda=Length. Likewise 3rd Harmonic occurs where 1.5lamda=Length and finally the fourth Harmonic where 2lamda=Length. This gives u 50 cm so A
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