How much work does a 725-kg hot air balloon do as it rises from a height of 1,025 m to a height of 1,275 m?

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?

Work = force × a. work b. energy c. distance d. momentum

Diamond will scratch quartz. true or false