. The relationship among mass, force, and acceleration is explained by
a. Newton's first law of motion
c. Newton's third law of motion
b. Newton's second law of motion d. the conservation of momentum

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