Askater holds her arms outstretched as she spins at 180 rpm. what is the speed of her hands if hey are 140 cm apart

What happens to light waves from a star as the star moves away from earth?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?