## Solution

Calculate the volumetric flowrate through each section:

9l=(0.2)(5)=lm3/s q2 = (0.3)(7) = 2.1 m3/s q3 = (0.25)(12) = 3m3/s

Since the fluid is of constant density, the continuity equation may be applied on a volume rate basis:

Therefore, flow is out of the control volume at section 4. Calculate the velocity v4:

Calculate the mass flowrate across section 4, m4:

## Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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