An object is moving in a circle. If the radius of the object is doubled, and the period remains constant, the magnitude of the velocity will be ___ original value.

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