A 300kg piano is at rest on a ramp with an angle of inclination of 27°. The angle is such that the piano is on the verge of sliding. Calculate the magnitude of the force of static friction on the piano. Is it directed down the ramp or up the ramp?

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Chapter1: Units, Trigonometry. And Vectors
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A 300kg piano is at rest on a ramp with an angle of inclination of 27°. The angle is such that the piano is on the verge of sliding. Calculate the magnitude of the force of static friction on the piano. Is it directed down the ramp or up the ramp?

 

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