Effective coefficient of friction
How much work did the movers do (horizontally) pushing a 44.0-kg crate 10.1m across a rough floor without acceleration, if the effective coefficient of friction was 0.60?
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Neglecting air friction, what minimum projection angle would achieve this result? What maximum pro- jection angle would achieve this result?
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Consider two conducting spheres with radii R1 and R2 separated by a distance much greater than either radius. A total charge Q is shared between the spheres. We wish to show that when the electric potential energy of the system has a minimum value
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A mass of 3.700 kg is suspended from a 1.410 m long string. It revolves in a horizontal circle. The tangential speed of the mass is 2.632 m/s. Calculate the angle between the string and the vertical (in degrees).
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