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an object of mass 5kg in plane on a plane inclined at an angle of 30 degree to the horizontal. calculate the force on the object perpendicular to the plane when the object is at rest.

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2 answers

  1. 5g cos30°

    think about it. when the plane is horizontal, the angle is zero, and the whole weight is down against the plane (cos 0° = 1)

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  2. Why is it that the horizontal is 5gcos30 not 5gsin30

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