How do you solve for $r$ $r$ in $\frac{1}{2} π r t = \frac{Q V}{s}$ $\frac { 1} { 2} \pi r t = \frac { Q V } { s }$ ?

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Answer 1 · 2018-08-06T20:55:54

Multiply both sides by $2 s$ $2s$ to remove the fractions

$π r s t = 2 Q V$ $pirst=2QV$

Divide by $π s t$ $pist$

$r = \frac{2 Q V}{π s t}$ $r=(2QV)/(pist)$

Answer 2 · 2018-08-06T21:01:01

$r = \frac{2 Q V}{π t s}$ $r = (2QV)/(pits)$

You need to isolate the factor $r$ $r$ on the left side.

$\frac{1}{2} π r t = \frac{Q V}{s} \leftarrow$ $1/2pi color(blue)(r) t = (QV)/s" "larr$ first $\times 2$ $xx 2$ on both sides

$cancel2 xx 1/cancel2 pi color(blue)(r) t = (2xxQV)/s$

Now divide both sides by $pi t$

$(pi color(blue)(r)t)/(pi t) = (2QV)/(pits)$

$color(blue)(r) = (2QV)/(pits)$

How do you solve for rrr in \frac { 1} { 2} \pi r t = \frac { Q V } { s }12πrt=QVs\frac { 1} { 2} \pi r t = \frac { Q V } { s }?