Question

In a horizontal oil pipe line of constant cross sectional area the decrease of pressure between two points 100 km apart is 1500 pa. The loss of energy per unit volume per unit distance is ----Joule.

• A. 15
• B. 0.015
• C. 0.03
• D. zero

Answer 1

The correct option is B 0.015

Decreases in pressure${10}^{5}m$\ apart$=1500pa$
energy cost per unit volume per unit distance$=\frac{1500\times {10}^{5}A}{{10}^5\times A\times {10}^5}=\frac{workdone}{lenght\times totalvolume}$
$=0.015joules$