A ball is launched with an initial velocity of 17.7 meters per second directly upward from the ground. How long will it take for the ball to come back to the ground?show work

What is the fate of the electrons that interact with a specimen in an electron microscope?

What are chlorofluorocarbons and what impact do they have on the atmosphere?

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?