A0.65 lb, 20 inch radius hula hoop is thrown forward with a velocity at the center of gravity of vg = 6 ft/s. however, the hula hoop initially has a backspin of ω = 3 rad/s. if the coefficient of kinetic friction between the hula hoop and the floor is μk = 0.5, determine the time required before the backspin stops. also determine the velocity of the center of gravity at this time. treat the hula hoop as a thin ring.

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

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assault rifle is a rapid-fire, magazine-fed rifle designed for military use. it is a shoulder-fired weapon that allows the shooter to select between semi-automatic (requiring you pull the trigger for each shot), fully automatic (hold the trigger and the gun continuously fires) or three-shot-burst modes.