What is an infectious disease? a. a disease such as cancer or heart disease that is not transmitted from one person to another b. any disease that is transmitted through direct person-to-person contact, by an animal that is infected, or through the environment c. a condition that develops in a baby during the mother's pregnancy or at birth d. a disease of the heart or blood vessels, such as hypertension, heart attack, and stroke

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?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

Photons with the highest energy have the longest period