A physics student observes a ball as it roll's down a ramp. She collects the following data.
mass = 38 grams
acceleration = 2 m/s2
initial velocity = 0 m/s
final velocity =l6 m/s
radius = 4 cm
How long did it take to roll down the ramp?

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