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Q 10.4 Explain why
(c) The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection
Answers (1)
Because of the extremely small size of the opening of a needle, its size can control the flow with more precision than the thumbs of a doctor.
According to the equation of continuity area * velocity= constant. if the area is very small the velocity must be large. Thus if the area is small flow becomes smooth
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