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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

    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...
  4. 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...
  5. 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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