The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection

The size of the needle of a syringe controls flow rate better than the

1.	The size of the needle of a syringe controls flow rate better than the thumb pressure exerted by a doctor while administering an injection
Answer» <P> Solution :For a constant height , the Bernoulli.s theorem is expressed as `P+(1)/(2)rhov^(2)` = constantHere , pressure occurs with a SINGLE power whereas the velocity occurs with a square power . Therefore , the velocity has more effect compared to the pressure . It is for this reason that needle of the syringe CONTROLS flow rate BETTER.