Mathematics (AS & A Level) · May / June 2018 · Paper 43 · Question 5
9709
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A particle of mass 3 kg is on a rough plane inclined at an angle of 20Å to the horizontal. A force of magnitude P N acting parallel to a line of greatest slope of the plane is used to keep the particle in equilibrium. The coefficient of friction between the particle and the plane is 0.35. Show that the least possible value of P is 0.394, correct to 3 significant figures, and find the greatest possible value of P. [6] 9
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