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A concrete block is pulled 9.2 meters across a frictionless surface by means of a rope. the tension in the rope is 36 newtons; and the net work done on the block is 187 joules. what angle does the rope make with the horizontal?
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One cubic meter (1.00m^3) of concrete has a mass of 2.30E+3kg, and 1.00m^3 of copper has a mass of 8.92E+3kg. Find the radius of an concrete sphere whose mass is the same as that of an copper sphere of radius 1.28cm?
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