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A block with mass 10kg is on a ramp angled at 20 degrees above the horizontal,...

A block with mass 10kg is on a ramp angled at 20 degrees above the horizontal, attached via rope to another block hanging over the top edge of the ramp (by a pulley), which is also 10kg. Wheat is the coefficient of static friction needed so that the blocks do not move? If there was no friction, what would the acceleration be?

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