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  1. D

    Biology; Chemistry; Physics: Post your doubts here!

    Mass was .504 kg and Energy was 114k something.
  2. D

    Biology; Chemistry; Physics: Post your doubts here!

    I don't think there was any need to convert. The areas of the pistons were in cm^2 and you could calculate the pressure in N/cm^2. Then multiply the 2 and get 166N
  3. D

    Biology; Chemistry; Physics: Post your doubts here!

    Sorry, it was 33N/cm^2.
  4. D

    Biology; Chemistry; Physics: Post your doubts here!

    166N wasn't the total force. It was the force exerted due to the pressure of 33.3 Pa in the liquid.
  5. D

    Biology; Chemistry; Physics: Post your doubts here!

    Solidification and evaporation.
  6. D

    Biology; Chemistry; Physics: Post your doubts here!

    I don't think you had to subtract anything. The liquid molecules are always exerting a force on the large piston. Therefore, the force exerted by pulling the lever WAS the additional force or increase in force.
  7. D

    Biology; Chemistry; Physics: Post your doubts here!

    I think the first one can be between 2.8 and 5.6 because image is diminished when it is between f and 2f.
  8. D

    English Paper1 threshold

    http://www.cie.org.uk/programmes-and-qualifications/cambridge-secondary-2/cambridge-o-level/results-statistics/ You say nobody scores A*, but if you look at the result statistics for the May/June examinations the A* percentage is almost always around 15%. It also shows that approximately 1 in 3...
  9. D

    Biology; Chemistry; Physics: Post your doubts here!

    The ruler is in equilibrium so downward force = upward force. From part b, upward force = 8 N. Downward force of weight + metre rule = 4 + 1.2 = 5.2 N To balance it out, the pivot must exert 8 - 5.2 = 2.8 N.
  10. D

    Biology; Chemistry; Physics: Post your doubts here!

    1500 years = 3 half lives 1/2^3 = 1/8th of original sample.
  11. D

    Biology; Chemistry; Physics: Post your doubts here!

    Here's a sketch of the vector diagram. Draw it accurately with an appropriate scale and you should get the correct answer.
  12. D

    Biology; Chemistry; Physics: Post your doubts here!

    something like this.
  13. D

    Biology; Chemistry; Physics: Post your doubts here!

    It says the 2 quantities are proportional. So you use the ratio method.
  14. D

    Biology; Chemistry; Physics: Post your doubts here!

    2.8 : 2 x : 10
  15. D

    Biology; Chemistry; Physics: Post your doubts here!

    From the table, a temperature difference of 50C produces a voltage increase of 1.5V. A temperature difference of x will produce a voltage difference of 0.6V (6.8-6.2). 50: 1.5 x : 0.6 Cross multiply and solve. x = 20. So there will be temp. rise of 20C. Add that to the original temperature. 750...
  16. D

    Biology; Chemistry; Physics: Post your doubts here!

    It is mentioned that angle of incidence is greater than critical angle.
  17. D

    Biology; Chemistry; Physics: Post your doubts here!

    P = E/t P = 432000000/ 24 * 60 * 60
  18. D

    Biology; Chemistry; Physics: Post your doubts here!

    Revise the 3 paths of light for converging lens.
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    That's what I have drawn.
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    It gets reflected instead of refracted.
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