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Recent content by Doctor Nemo

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    Mathematics: Post your doubts here!

    Aw com´on u otter no that an improper one is when the part in the numerator has an exponential equal to or greater than that of the denominator
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    Chemistry: Post your doubts here!

    The answer is B because all you want to do is rinse the flask with water. You would start with tap water because it is less expensive than distilled water. The carbonates might be insoluble in water but that doesn´t prevent the surface from reacting with acid. Metals are insoluble in water...
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    Physics: Post your doubts here!

    Good question Because it has an equal number of plus and minus charges so the net charge in the capacitor is 0. A capacitor is like a rechargeable battery that can be quickly charged and decharged.
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    Chemistry: Post your doubts here!

    Sorry, I was being sarcastic. The Chemistry Applications booklet is rather poor. The newer version looks better and seems to have less excess material that you do not need to know. Make sure you are using that version. Much of the material can be found in biology books for example. If you do...
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    Physics: Post your doubts here!

    You are only interested in the current going through the 6 ohm resistor not the total current leaving the battery. The answer does not depend on the resistance of the variable resistor only the amount of the variable resistor that is in parallel with the 6 ohm resistor. If the arrow was in the...
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    Physics: Post your doubts here!

    Actually there are two right angles. Maybe they are referring to the right angle coming out of the paper so the situation is not like that of a magnetic field.
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    Physics: Post your doubts here!

    When the arrow of the potential divider is on the far left the 6 ohm resistor is in parallel with just the wire connecting the potential divider to the circuit. The voltage across this is 0 so the minimum current is 0. When the arrow is on the far right the arrow is now in parallel with all...
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    Physics: Post your doubts here!

    I agree that makes no sense. Maybe the mark scheme is wrong.
  9. D

    Physics: Post your doubts here!

    Why not at right angles to the field? Imagine the proton traveling between the two parallel plates in the figure above this question. There will be a downward force on it and you calculate it from the electric field strength as F/Q so answer is charge on proton X 2.40 × 10–6 V m–1.
  10. D

    Chemistry: Post your doubts here!

    c Just memorize the contents of the entire booklet and you will know most of what is needed for the exam.
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    I can't cncentr8 on one thing..Even on studies during exams

    Read the want adds for employment. See what jobs you would be qualified for and ask yourself if you want to spend the rest of your life working in a fast food restaurant. Motivation is almost as important as ability.
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    Physics: Post your doubts here!

    For b the average force is just the change in momentum over time. So for the one on the right it is just (0.5k X 3.8 m/s)/0.25 =7.6N
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    Mathematics: Post your doubts here!

    Perhaps this explanation of Argand diagrams might be helpful. Complex numbers can be represented as a vector in a diagram called an Argand diagram. The x-axis is the real number part and the y-axis is the imaginary part. The length of the vector or line representing the complex number is...
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    Chemistry: Post your doubts here!

    You again, good thing I have had some wine with my dinner. OK the basic idea is that the two gases are independent of each other and the total pressure is simply equal to the sum of the pressure of each gas. You apply P1V1 =P2V2 to each gas separately. After the valve is open the volume is 3...
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    Chemistry: Post your doubts here!

    For 6 I can only get the answer of 2.72 dm3 and the closest answer is 2.67 so I chose C which is correct. Just put the numbers into the ideal gas equation for 1/18 moles of H2O 101000 X V = .05555 X 8.31X 596 ----> V = 2.72 X 10-3 cubic meters or 2.72 dm3 8 is difficult and I don´t have...
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