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  1. S

    Chemistry: Post your doubts here!

    Q10) I'll try to do a proper explanation later, i'm a little fuzzy on this one still. Q11) When two different atoms are bonded together, from what I recall (well, this page confirms it, either ways) the more electronegative kind of atom receives the negative value of the oxidation state. So...
  2. S

    Then why so many questions at the last minute?

    Then why so many questions at the last minute?
  3. S

    Chemistry: Post your doubts here!

    Q4) Alright, so if 120 kilograms of hydrogen are used initially and at equilibrium, 96 kilograms of hydrogen remain, we can say that 120 - 96 = 24 kilograms of Hydrogen have been used up. (Note, that here we are concerned with H₂ molecules). Since the mass of 1 mole of H₂ molecules is 2 grams...
  4. S

    Thanks for understanding! (But that doesn't mean I won't post, just that i'll post in parts...

    Thanks for understanding! (But that doesn't mean I won't post, just that i'll post in parts instead of all at a time!)
  5. S

    I'll try, then, to post something in the Chem forum. Today I have a little work aside from my...

    I'll try, then, to post something in the Chem forum. Today I have a little work aside from my regular schedule, so I might not be able to post much later.
  6. S

    I'm not that good at chem, but I'll come over anyways :-)

    I'm not that good at chem, but I'll come over anyways :-)
  7. S

    Physics: Post your doubts here!

    First Question) Okay, so what we need to find out is the percentage uncertainty in the value of the volume of the sphere with a radius measurement of r = 5.00 mm ± 0.01 mm. The formula for volume of a sphere as a function of radius is 4πr³/3. Therefore, we are multiplying r into r into r to...
  8. S

    Physics: Post your doubts here!

    Q3) The volt is defined in a very specific manner; it is not defined by the equation "V = IR", but by a different equation. The definition itself is "The Volt (as it pertains to an electric current) is the electric potential energy per unit charge, i.e. per coulomb, at any point in the...
  9. S

    Physics: Post your doubts here!

    This is the wording of the question, as posted originally: "Q19: The Mariana Trench in the Pacific Ocean has a depth of about 10 km. Assuming that sea water is incompressible and has a density of about 1020 kg m–3, what would be the approximate pressure at that depth? A 10^5 Pa B 10^6Pa C...
  10. S

    Physics: Post your doubts here!

    Yep! (y) That's alright, no probs! Good Luck for all your exams!
  11. S

    Physics: Post your doubts here!

    23) When the force W is applied on R, the spring R gets the full load of the force. In other words, the force extending R is equal to the force W. Therefore, the extension of spring R is equal to (using the formula |F| = kx): x = |F|/k = W/k = W/3k (since the spring constant of R is 3k). Now...
  12. S

    Physics: Post your doubts here!

    Since the ball is balanced and in equilibrium, we can say that the net force on the ball is equal to zero. We can also split this net force into two components, one in the up-down (vertical) direction and another in the left-right (horizontal) direction. Let's also say that the upwards direction...
  13. S

    Physics: Post your doubts here!

    Q9) Either ways, the working for this question can be very easy if you work in a particular manner; first point is that Force = Δ(mv)/Δt, and if we take Δt to be 1 second, the equation is reduced to it's simplest form - Force = Δ(mv) in 1 second, i.e. force is equal to change in momentum in 1...
  14. S

    Physics: Post your doubts here!

    Can't reply now, but i've answered Q19 earlier, so i'm pasting that here: 19) Take the load on the right-hand side string. Since that load is in equilibrium, the tension force on it has to be equal to it's weight, which we are given is 100 Newtons. Now take the scale on the right. The scale...
  15. S

    Physics: Post your doubts here!

    Suppose light goes from the source L, it has an amplitude A (suppose). Then, some waves pass through the upper slit and some waves pass through the lower slit (on the diagram. In real life, this is a top-down view, so the slits are right next to each other horizontally). The waves that pass...
  16. S

    Physics: Post your doubts here!

    The Potential Difference through the circuit is some value V. The current through the circuit, as we can see after combining the resistances, is equal to 2V/3R. So, the current in the circuit is 2V/3R and the voltage across the total resistance is V. Therefore, by P = IV, we can write (Total...
  17. S

    Physics: Post your doubts here!

    Q12) Suppose we take the threads and the picture as the system. Then, the only forces on our "system" are the weight of the system (the force of gravity on it) and the tension force from the uppermost string. In other words, the forces in both cases are i) Weight of the system, acting...
  18. S

    Physics: Post your doubts here!

    Try it now:D
  19. S

    Physics: Post your doubts here!

    This should help, if you still have any doubts, make sure to post on the forums: https://www.xtremepapers.com/community/threads/physics-post-your-doubts-here.9860/page-535#post-823687 Good Luck for all your exams!
  20. S

    Physics: Post your doubts here!

    Electrons are negatively charged, and as such they will move from an area of lower potential to an area of higher potential. Also, they will move away from the negative terminal and towards the positive terminal (conventional current moves in the opposite direction, and in reality this flow of...
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