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  1. S

    Physics: Post your doubts here!

    The equation relating the extension of a spring to the force that caused that extension is F = -kx Where F is the force vector, k is the spring constant of the spring (that concerns the stiffness of the spring) and x is the extension = (Length after application of force) - (original length)...
  2. S

    Physics: Post your doubts here!

    Q25) For this question, you have to be very careful with the wording, of both the statement and the answer. The question says that the view of the calculator screen through the polaroid changes when the polaroid film is rotated. It does not tell us how the view changes, or whether the view...
  3. S

    Physics: Post your doubts here!

    The box accelerates to the right and the 2.0 kg mass accelerates downwards, since they are both connected by a string (and the string cannot stretch at will). Suppose the mass moves down a little bit, the box will also move that same distance, that little bit, to the right. So the acceleration...
  4. S

    Physics: Post your doubts here!

    The main point to understand is this - the Young's Modulus is basically a calculated value that we can find out from measurements and use later. It is akin to density - there's very few things that depend on density, but density depends on many other factors and density is also a constant for a...
  5. S

    Physics: Post your doubts here!

    Suppose the resistance of one of the resistors is R. Then the combined resistance of Q and R is given as follows: 1/R(Q + R) = 1/R(Q) + 1/R(R) = 1/R + 1/R = 2/R Therefore, R(Q + R) = R/2. This resistance is in series with R(P), and since they are in series we can add them straight away: R(P +...
  6. S

    Physics: Post your doubts here!

    The concept here is pretty straightforward - at any point in an electric field, the force on a charged particle acts along the tangent to the electric field line at that point. In other words, the force on a particle placed on a curved field line will act along the direction of the tangent of...
  7. S

    Physics: Post your doubts here!

    The instantaneous velocity (at any instant, instead of an average) of any moving object is equal to the rate of change of displacement. In this case, the displacement is only along one axis, the up-down (vertical) axis. Therefore, the only measurements needed to qualify the displacement are...
  8. S

    Physics: Post your doubts here!

    Q15) We have to consider the two elements or conditions of equilibrium: i) For translational equilibrium, no net force must act on the system; ii)For rotational equilibrium, not net torque must act on the system about any point. Let's take the crane itself to be the system. Then forces are...
  9. S

    Physics: Post your doubts here!

    5) There is a rule that when dividing or multiplying two or more numbers, the result should be stated to the same number of significant figures as in the multiplier with the same number of significant figures. For example, suppose we have three numbers, A = 2.570, B = 5.0 and C = 5.89678...
  10. S

    Physics: Post your doubts here!

    36) Any two conductors connected to each other by another conductor will have the same potential. This is like having two separate tubes of water (each one represents one conductor), with different amounts and different heights in each (the height represents the potential, the amount represents...
  11. S

    Physics: Post your doubts here!

    Alright, then: 31) When a charged particle is placed anywhere in space, it extends an electric field around it, that spreads in all possible directions, and exists whether or not there is any other particle present to experience the force. Therefore, the particle Q creates an electric field...
  12. S

    Physics: Post your doubts here!

    Q15) 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...
  13. S

    Physics: Post your doubts here!

    The pressure of a liquid at a depth below it's surface is given by the formula Pressure = ρgh Where ρ is the density of the liquid, g is the average gravitational field strength along that liquid column and h is the depth of the liquid column from the surface till the point where the pressure...
  14. S

    Physics: Post your doubts here!

    This image should clear up things: So for any stretchable material, we can say that there is a point of applied stress until which they will stretch in a linear manner, i.e. with a constant value of the Young's Modulus. So until this point, the stress will be proportional to the strain...
  15. S

    Physics: Post your doubts here!

    As long as you understand the concepts involved, I appreciate it too :) So are those first few doubts from November 2013 P13?
  16. S

    Physics: Post your doubts here!

    So the key thing to notice here is that when the circuit is working properly, the potential difference across the relay will be 16 Volts, and the current through it will be 0.6 Amperes (if the voltage isn't 16 Volts or the current isn't 0.6 Amperes, the relay circuit will not work properly)...
  17. S

    Physics: Post your doubts here!

    9) If only one person is using the elevator, the mass of the person+elevator = 80 kg + 520 kg = 600 kg. Suppose we take both the person and the elevator as our system. Let's take a look of at the forces acting on them. i) The gravitational force of mg = (600 kg) * (9.81 ms⁻²) = 5886 kg ms⁻²...
  18. S

    Physics: Post your doubts here!

    For the first link the text shows "s13_qp_13.pdf" while the pdf file that loads is "s13_qp_12.pdf". Which one is it that you have the doubts in? For the second paper, here are the answers : Q9)...
  19. S

    Physics: Post your doubts here!

    Q5) 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 get r³, and...
  20. S

    Physics: Post your doubts here!

    The resistivity of both wires is equal to ρ, since they are both made of the same material and resistivity is only a property of a material, not a sample. The formula relating resistance to the physical properties of the sample concerned is Resistance = ρl/A In this case, there are two wires...
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