Question

1. If the specific weight of a liquid is 8.1 kN/m_­­­­³, what is its density?

2. If the specific volume of a gas is 0.70 m³/kg, what is its specific weight in N/m³?

3. If a certain liquid weighs 8600 N/m³, what are the values of its density, specific volume, and specific gravity relative to water at 4⁰C?

4. At a depth of 12 m of a solvent the pressure at the bottom of the covered storage tank due to the solvent was 350 kPa. Calculate density of the solvent.

5. At what depth within a salt water solution will the gauge pressure be equal to three times the atmospheric pressure?                    
   ρ salt water=1100 kg/m³                                             atmospheric pressure =101,325 Pa

6. How large must a heating duct be if air moving 3 m/s along it can replenish the air in a room of 300 m³ volume every 15 minutes? Assume the air’s density remains constant.

8. Water is flowing in a fire hose with a velocity of 1.0 m/s and a pressure of 200000 Pa. At the nozzle the pressure decreases to atmospheric pressure (101300 Pa), there is no change in height. Use the Bernoulli equation to calculate the velocity of the water exiting the nozzle.   

10. At Petrojam, fuel is flowing through a pipe at a velocity of 1 m/s and a pressure of 101300 Pa. They need the fuel to be at a pressure of 3 atm (202600 Pa) on a lower level. How far must the pipe drop in height in order to achieve this pressure if the velocity does not change? The density of the fuel is 789 kg/m3.

Answer 1