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  1. S

    Physics: Post your doubts here!

    Q13) To balance the rule, the net moment on it about any point should be equal to zero. Furthermore, since the tension in the string is trying to turn the rule anti-clockwise, we have to place a weight in such a position that it will try to rotate the rule clockwise. Intuitively, we can say...
  2. S

    SO what do you want, electricity or Young's Modulus? I can't do all of them in one hour, even if...

    SO what do you want, electricity or Young's Modulus? I can't do all of them in one hour, even if I can it will not be very useful. This is not supposed to be a concept that I can explain in 1 hour, this should be learnt over time.
  3. S

    I don't have the coursebook, i'm using uni textbooks right now, sorry - but i'll try to post...

    I don't have the coursebook, i'm using uni textbooks right now, sorry - but i'll try to post whatever I can asap.
  4. S

    ah, okay - i prefer phy and math, with little bit of chem too ;-)

    ah, okay - i prefer phy and math, with little bit of chem too ;-)
  5. S

    Thoda sa Chem, zyada nahin. Kyun?

    Thoda sa Chem, zyada nahin. Kyun?
  6. S

    Physics: Post your doubts here!

    The Efficiency = (Useful Output energy)/(Total Input Energy). Let's look at the changes in energy in the process. Since the kinetic energy of the car doesn't change and remains at v, there is no change in the kinetic energy of the car. Since friction does not do any work (we can assume this...
  7. S

    Physics: Post your doubts here!

    Just solved it a while back, hope it helps! Good Luck for all your exams!
  8. S

    i'm doing those problems in convo, right now

    i'm doing those problems in convo, right now
  9. S

    i wuz answering another question - don't worry, bhai, i'll reply asap.

    i wuz answering another question - don't worry, bhai, i'll reply asap.
  10. S

    Physics: Post your doubts here!

    This question needs the use of dimensional analysis - there is no theory in the syllabus that can be used to derive this, so we use dimensional analysis. The units of speed are m/s = Meters/Second. These are the dimensions of Length and Time respectively, so we write their dimensions as LT^-1...
  11. S

    no worries!

    no worries!
  12. S

    ok, just give me a few minutes

    ok, just give me a few minutes
  13. S

    Oh, went to have some tea ;-)

    Oh, went to have some tea ;-)
  14. S

    Yo, bro, watcha doin?

    Yo, bro, watcha doin?
  15. S

    Physics: Post your doubts here!

    Arre Baapre, kya kiya maine?! :D Hadi, what I drew on that image isn't gradient. I know that much :LOL: Any point A, B, C or D, we can write as (V, I). The resistance is V/I, which is 1/(I/V). I/V just happens to be the gradient of the line joining A,B,C or D to the origin ([I-0]/[V-0]). So...
  16. S

    Physics: Post your doubts here!

    Just saying kyunki gradient of curve ek baar lena tha na, so gradient at A, B and C would be found by differentiation/ drawing gradient, etc. No need for it, just saying.
  17. S

    Physics: Post your doubts here!

    The fact is that the gradient is not what affects the resistance; at any point, the resistance of a material can be obtained by applying a potential difference V across it's terminals, and measuring the current I through it. After doing this, the value of V/I should give you the resistance of...
  18. S

    Physics: Post your doubts here!

    Short answer, because the time taken with each speed is different. Let's do the math behind this - suppose the distance traveled with both speeds is denoted by "s". Suppose the time taken at 600 kmph = t(1). Then, since Speed = Distance/Time, we can write 600 = s/t(1) So that t(1) = s/600...
  19. S

    Physics: Post your doubts here!

    Alright, so here Q represents the actual voltage (since it is prorperly calibrated) and P represents a skewed voltage. The problem is that P has a zero error. The meaning of a zero error is that the meter will not actually give a reading of exactly zero when the voltage through it is zero; it...
  20. S

    Physics: Post your doubts here!

    The diving board is in equilibrium - it is not accelerating, it is not revolving. If an object is not accelerating, there is no net force on the object. If an object is not rotating, there is no net torque on the object. The boy is stationary, so the force exerted on him by the board that...
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