A $0.5 k g$ ball moves in a circle of radius $0.4 m$ at a velocity of $4 m / s$ . The centripetal force on the ball is:

10 N

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20 N

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40 N

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80 N

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Solution

The correct option is B $20 N$
$F = \frac{m v^{2}}{r}$
$F = \frac{0.5 \times 4 \times 4}{0.4}$
$F = \frac{8.0}{0.4}$

$= \frac{80}{4} = 20 N$

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A 0.5kg ball moves in a circle of radius 0.4m at a velocity of 4m/s. The centripetal force on the ball is:

The correct option is B 20NF=mv2rF=0.5×4×40.4F=8.00.4 =804=20N

A $0.5 k g$ ball moves in a circle of radius $0.4 m$ at a velocity of $4 m / s$ . The centripetal force on the ball is:

The correct option is B $20 N$
$F = \frac{m v^{2}}{r}$
$F = \frac{0.5 \times 4 \times 4}{0.4}$
$F = \frac{8.0}{0.4}$

$= \frac{80}{4} = 20 N$