1. The problem statement, all variables and given/known data An object of mass 0.5 kg is swung in uniform circular motion. The radius is 2 meters, and the force exerted is 4 N. Calculate the magnitude of the velocity. Answer Choices: a) 0.25 m/s b) 1 m/s c) 4 m/s d) 16 m/s 2. Relevant equations v = 2piR/T F = mv^2/R 3. The attempt at a solution Since I didn't know the variable time, I couldn't use the velocity equation. Next, I tried plugging in the variables for the centripetal force equation and solving for velocity: 4 = (0.5)v^2/2 4 = 0.5/2 + v^2/2 4 = 0.3 + v^2/2 <- 0.3 because of significant figures (subtracted 0.3 from both sides) 4 = v^2/2 <- 4 because of significant figures (multiplied both sides by 2) 8 = v ^2 (took the square root of both sides) v = 3 which isn't one of my answer choices. Maybe I'm not doing my algebra correctly or maybe I'm not using the right equation, but I couldn't find another equation using the variables I have. If I knew the time it took for one revolution I could use the velocity equation, but I don't know how to find time and I couldn't find an equation for finding it.