The speed of the block is expressed as:

$\overline{){\mathbf{v}}{\mathbf{=}}{\mathbf{\omega}}{\mathbf{r}}}$

Centripetal force:

$\overline{){{\mathbf{F}}}_{{\mathbf{c}}}{\mathbf{=}}\frac{\mathbf{m}{\mathbf{v}}^{\mathbf{2}}}{\mathbf{r}}}$

A 300 g block on a 56.0 cm-long string swings in a circle on a horizontal, frictionless table at 90.0 rpm

A) What is the speed of the block?

B) What is the tension on the string?

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