A student pulls with a 25 N force on a 100 kg box. As a result, the box moves with constant velocity. How much friction must be present? 75 N
100 N
4 N
25 N

Positrons are spontaneously emitted from the nuclei of

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?

During the past 150 years in the united states, how did energy consumption compare to population growth