What is the angular speed (in rpm) with which the Earth spins on its axis?

Who was the first scientist to measure speed as distance over time?

Select the correct answer. what does the process of natural selection involve?

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton