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  1. U

    Applying W=F*s for variable force

    1. Homework Statement A car of mass 2000kg moves along a horizontal road against a constant resistance of manitude (P)N. The total work done by the engine in increasing its speed from 4ms^-1 to 5.5ms^-1 while it moves a distance of 60m is 30000J. Find P. 2. Homework Equations ΔEk+WP=WE 3...
  2. U

    Calculation of Change in Magnetic Flux Linkage Across a Wire

    1. Homework Statement A straight wire of length 0.20m moves at a steady speed of 3.0m/s at right angles to a magnetic filed of flux density 0.10T. Use Faraday's law to determine the e.m.f. induced across the ends of a wire. 2. Homework Equations E= Nd Φ/dt but N=1 so E= dΦ/dt 3. The Attempt...
  3. U

    Question Concerning The Coefficient of Friction: Block on a Rough Inclined Plane

    I will write down the calculations in the pictures here just for clarification. First picture: For P(min), the box will be on the point of sliding down with P pushing up the slope. (1):20gcos(60)μ+P(min)=20gsin(60) For P(max), the box will be on the point of going up with P pushing up the...
  4. U

    Question Concerning The Coefficient of Friction: Block on a Rough Inclined Plane

    1. Homework Statement A block of mass 20kg is on rest on a rough plane inclined at 60 degrees to the horizontal. A force P is applied to the block to "maintain equilibrium". P is parallel to the line of greatest slope of the inclined plane. The maximum value of P is twice the minimum value of...
  5. U

    IGCSE Pressure Question: How many balloons can be inflated?

    Ah, now I understand.. Thank you very much!:biggrin:
  6. U

    IGCSE Pressure Question: How many balloons can be inflated?

    If the volume of helium in the balloon is 0.15m3 at that pressure, then why not? We use all the 0.15m3 because 0.15 is divisible by 0.030 without any remainders...
  7. U

    IGCSE Pressure Question: How many balloons can be inflated?

    Hi, very quick question... It does like this: Helium in a cylinder (Which will be used to inflate a number of balloons) has a volume of (6*10-3) cubic meters and a pressure of (2.75*106)Pa. The pressure in each of the helium balloons is (1.1*105)Pa, and the volume of each balloon (3*10^-3) cubic...
  8. U

    IGCSE Physics Question About Fluid Pressure

    Hi, very quick question... It does like this: Helium in a cylinder (Which will be used to inflate a number of balloons) has a volume of (6*10-3) cubic meters and a pressure of (2.75*106)Pa. The pressure in each of the helium balloons is (1.1*105)Pa, and the volume of each balloon (3*10^-3) cubic...
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