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  1. D

    Biology; Chemistry; Physics: Post your doubts here!

    Yeah, I think so. I didn't attempt that question though.
  2. D

    Biology; Chemistry; Physics: Post your doubts here!

    It had a decreasing gradient.
  3. D

    Biology; Chemistry; Physics: Post your doubts here!

    Increase voltage of Q
  4. D

    Biology; Chemistry; Physics: Post your doubts here!

    According to Pure Physics, Work = Force * Displacement. Energy in the system is constant so work will remain the same. Since the force on the second piston is larger, the displacement will be smaller to keep the value of work constant.
  5. D

    Biology; Chemistry; Physics: Post your doubts here!

    Like I said earlier, the force exerted due to the pressure was the amount by which it increased. Suppose when nothing is pulled or pushed, the force due to the pressure of the water molecules on the piston is 10N. When you pull the lever 166N is applied. Total force is 176. Increase is 176 - 10...
  6. D

    Biology; Chemistry; Physics: Post your doubts here!

    If pressure was 33.33 then Force = 33.33 * 5 = 166.7 N
  7. D

    Biology; Chemistry; Physics: Post your doubts here!

    wat. Isn't Force = Pressure x Area?
  8. D

    Biology; Chemistry; Physics: Post your doubts here!

    How did you get 3.3?
  9. D

    Biology; Chemistry; Physics: Post your doubts here!

    There aren't many others. Bromine is reddish brown. Iodine is black solid and purple gas.
  10. D

    Biology; Chemistry; Physics: Post your doubts here!

    The brown gas will be nitrogen dioxide.
  11. D

    Biology; Chemistry; Physics: Post your doubts here!

    It was 72000/(34*4200). M = E/(Temp. change * specific heat capacity)
  12. D

    Biology; Chemistry; Physics: Post your doubts here!

    oh, ok. I didn't know the extra .004 could make a difference of almost 1000J O.o
  13. D

    Biology; Chemistry; Physics: Post your doubts here!

    Second was 114307J. 4200 * 0.504 * 54
  14. D

    Biology; Chemistry; Physics: Post your doubts here!

    I'm not sure about that one, but for less than 1 cm, I wrote 3.5 cm because image is diminished when f < v < 2f and for more than 1 cm, I wrote 6 cm, because image is magnified when v > 2f
  15. D

    Biology; Chemistry; Physics: Post your doubts here!

    I don't see anything wrong with that...
  16. D

    Biology; Chemistry; Physics: Post your doubts here!

    If you did not convert the area from cm^2 to m^2, the answer should have been in N/cm^2. Pa is N/m^2.
  17. D

    Biology; Chemistry; Physics: Post your doubts here!

    For the answer mark, you have to give the right unit, so it will be just 1 mark deduction.
  18. D

    Biology; Chemistry; Physics: Post your doubts here!

    The car was travelling at a constant speed (forward force = backward force) so resultant was zero.
  19. D

    Biology; Chemistry; Physics: Post your doubts here!

    It was area of triangle + area of rectangle. (1/2 * 2.4 * 3) + (5*2.4) = 15.6. You could do it in both N/cm^2 and Pa. Constant but not zero was K.E
  20. D

    Biology; Chemistry; Physics: Post your doubts here!

    Glass prism has a higher refractive index than air, which means light travels slower in there. When white light enters the prism, it changes direction because of the slower speed. Red and blue have difference wavelengths and frequencies so they change directions by different amounts. Due to...
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