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  1. Mathemagical

    Physics: Post your doubts here!

    Frequency of radio wave: 100 GHz Mass of atom: 10^-27 kg Young Modulus of a metal: 200 GPa
  2. Mathemagical

    Physics: Post your doubts here!

    I wouldn't call spacing between liquid molecules "far", it is only a little less closely packed than molecules in a solid.
  3. Mathemagical

    Physics: Post your doubts here!

    You forgot the vertical contact force exerted by the weight on the road. According to Newton's 3rd Law, the road exerts the same force but in the opposite direction. Therefore, the answer is B, which is the resultant of the 2 forces.
  4. Mathemagical

    Physics: Post your doubts here!

    We know that the blocks must have the same acceleration. Applying Newton's Second Law to the entire system, we get F = 4ma a = F/4m Fy = myay Fy = 3m (F/4m) Fy = 3F/4
  5. Mathemagical

    Physics: Post your doubts here!

    Actual uncertainties are usually written to 1 significant figure. In this case, the actual uncertainty is 9.8298, so we round it off to 10. Since the significant digit is in the tenths, the calculation would be written as 330 m/s.
  6. Mathemagical

    Physics: Post your doubts here!

    Take the 3 10 ohm resistors on the right to be one 30 ohm resistor connected in parallel with the 10 ohm resistor.
  7. Mathemagical

    Chemistry: Post your doubts here!

    HCO2H dissociates into H+ and HCO2- ions, so there is only one mole of hydrogen ions per mole of methanol acid.
  8. Mathemagical

    Chemistry: Post your doubts here!

    Yes, H2SO4 can behave as an acid because it can donate a proton to ethanol.
  9. Mathemagical

    Physics: Post your doubts here!

    If the heating element is glowing light red, it's between 800 and 900 degrees.
  10. Mathemagical

    Physics: Post your doubts here!

    Elastic energy per unit volume = (½ Fx) / AL. = Sx / 2L [F / A = S] = S {strain} / 2 [Young modulus, E = stress S / strain. So, strain = S / E] Elastic energy per unit volume = SS...
  11. Mathemagical

    Chemistry: Post your doubts here!

    Option 2 is incorrect. Sulfuric acid can act as an acid because the oxygen atom in ethanol has two lone pairs, either of which can accept the proton.
  12. Mathemagical

    Chemistry: Post your doubts here!

    Since it does not have cis-trans isomers, the two groups on the right side of the C=C bond must be identical. C has 4 bonds: one double bond and two of them to the C2H5 groups.
  13. Mathemagical

    Chemistry: Post your doubts here!

    Option 2 is a salt, so it will be found in the flask. The question specifies on the distillate.
  14. Mathemagical

    Chemistry: Post your doubts here!

    The organic product is a carboxylic acid, which is not coloured.
  15. Mathemagical

    Chemistry: Post your doubts here!

    Permanent dipole would be C=O, and induced dipole would be C-N
  16. Mathemagical

    Chemistry: Post your doubts here!

    Since it is not affected by OH- ions, the reaction mechanism is Sn1. Only tertiary halogenoalkanes undergo Sn1 reactions.
  17. Mathemagical

    Chemistry: Post your doubts here!

    LiAlH4 is commonly used as a reducing agent. In this case, it reduces the aldehyde into a primary alcohol.
  18. Mathemagical

    Chemistry: Post your doubts here!

    SiO2 is acidic and will not react with hydrochloric acid. Calcium carbonate will react with hydrochloric acid to form calcium chloride, carbon dioxide and water.
  19. Mathemagical

    Chemistry: Post your doubts here!

    SO2 + Ca(OH)2 ---> CaSO3 + H2O
  20. Mathemagical

    Physics practical - ( 34 ) GT and General discussion.

    Judging from the general response in the different forums I've been to, I'd say it's between 25 and 30.
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