The figure shows a horizontal pipe with a circular cross section whose diameter varies. The cross-sectional area at X is 3.0×10−4m2 and at Y is 0.60×10−4m2. Water of density 1000kg/m3 fills the pipe and flows through it at a constant rate of 2.4×10−4m3/s. The difference in pressure between X and Y is most nearly 750 Pa 750 Pa A 1600 Pa 1600 Pa B 7700 Pa 7700 Pa C 8320 Pa 8320 Pa D

By Bernoulli's Principle :

Since , pipe is horizontal so every point is at same height .

So , .

The equation will reduced to :

   ..... 1 )

Also flow rate will be constant :

Now ,

Difference in pressure between X and Y is most near to 7700 Pa.

Hence, this is the required solution.

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.

i think it's 35 meters