Write the chemical reactions for a weak base and a strong base

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

Power can be defined as a. the distance over which work was done. b. how much work can be done in a given time. c. all the work in an given area. d. the energy required to do work.

What would be the radius of the earth if it had its actual mass but had the density of nuclei? express your answer to two significant figures and include the appropriate units.