The rate of flow of water through a horizontal pipe of changing cross section is 100 litres per hour. Calculate the velocity of water flow at a point where diameter of the tube is 4 cm?

Explanation

To solve the problem of calculating the velocity of water flow at a point in a horizontal pipe with a changing cross-section, we will follow these steps:

### Step 1: Convert the flow rate from liters per hour to cubic meters per second.
The given flow rate is 100 liters per hour. We need to convert this to cubic meters per second (SI unit).

1 liter = 0.001 cubic meters, so:
\[
100 \text{ liters} = 100 \times 0.001 \text{ m}^3 = 0.1 \text{ m}^3
...