A0.50-kg object moves in a horizontal circular track with a radius of 2.5 m. an external forceof 3.0 n, always tangent to the track, causes the object to speed up as it goes around. thework done by the external force as the mass makes one revolution is:

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excesselectrons is typical. what is the magnitude of the electric forceon a protein with this charge in a 1500 n/c electric field?

How do i solve this physics problem?

City b is south of city a, and the 200 mile trip by car takes 4 hours. the cities are 120 miles apart in a straight line. what is the velocity of a trip from city a to city b?