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The rotor blades of a helicopter are 20 ft long and are rotating at 100 rpm.  a. Find the angular speed of the rotor.  b. Find the linear speed of a point on the tip of a blade.

    Which of the following shapes is it NOT possible for a cross section of a cube to take.   equilateral triangle                    ...

    Help solving....   If the ratio of the volumes of two similar solids is 8 : 125, then what is the ratio of their surface areas.   thanks

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