Aweightlifter lifts a 1250-n barbell 2 m in 3 s. how much power was used to lift the barbell?

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The metric unit of electrical power is the watt volt ampere ohm

Explain vector addition, triangle method and parallelogram method

Aperson stands on a platform, initially at rest, that can rotate freely without friction. the moment of inertia of the person plus the platform is ip. the person holds a spinning bicycle wheel with its axis horizontal. the wheel has moment of inertia iw and angular velocity ωw. take the ωw direction counterclockwise when viewed from above. part a what will be the angular velocity ωp of the platform if the person moves the axis of the wheel so that it points vertically upward?