A jet ski shoots a jet of water out the back, which propels the jet ski forwards. The force on the jet of water and the force on the jet ski is: 1.) Equal in strength and act in the same direction.

2.) Unequal in strength and act in opposite directions.

3.) Unequal in strength and act in the same direction.

4.) Equal in strength and act in opposite directions.

Which of the following elements is in the same period as phosphorus? a. carbon c. nitrogen b. magnesium d. oxygen select the best answer from the choices provided a b c d

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?

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential