B. A crowbar of 2m is used to lifi an object of 800N. If the effort arm is 100 calculate the effort applied.
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What is the magnitude of the resultant vector round your answer to the nearest tenth

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?

Can anybody me with this? ? (picture included.)