Playing with a water hose

To increase the range of the water, Isabella places her thumb on the hose hole and partially covers it. Assuming that the flow remains steady, what fraction f of the cross-sectional area of the hose hole does she have to cover to be able to spray her friend?

Assume that the cross-section of the hose opening is circular with a radius of 1.5 centimeters.

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genius_generous answered 2 years ago

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