Electricity runs our television and any other electronic gadgets. It cannot be detected directly by our senses, but its effects can be observed. Which of the following is the basic property of matter which makes electricity useful? A. electric charge B. electron C. neutron D. proton

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?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.