A hot air balloon with a mass of 400 kilograms moves across the sky with 3,200 joules of kinetic energy, what is the velocity of the ballon?

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?

7types of electromagnetic waves from lowest to highest frequency

The amount of potential energy possessed by an elevated object is equal to