## Conceptual Physics (12th Edition)

1. a. Start with F = $m \frac{v^{2}}{r}$. The string tension T provides the net force F, and the length L is the radius of the path. $$T = m \frac{v^{2}}{L}$$ $$m=\frac{T L}{v^{2}}$$ b. Plug in values. $$m=\frac{(10 N)(2 m)}{(2 m/s)^{2}} = 5 kg$$