If you lower the window on a car while moving, an empty plastic bag can sometimes fly out the window. Why does this happen?
The empty plastic bag flies out of the moving car due to pressure difference created when window of car is lowered.
According to the Bernoulli’s principle, the total energy per unit volume of a fluid is constant. The points of the higher fluid speed will be having less pressure than the points of the slower fluids.
When the window of the moving car is lowered, a pressure difference is created on both the sides of the car. The fluid outside of the car has higher speed with less pressure and the fluid inside the car has low speed with high pressure. So, the empty plastic bag flies away from high pressure inside the car to low pressure outside the car.
The main uptake air duct of a forced air gas heater is 0.300 m in diameter. What is the average speed of air in the duct if it carries a volume equal to that of the house’s interior every 15 min? The inside volume of the house is equivalent to a rectangular solid 13.0 m wide by 20.0 m long by 2.75 m high.
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