A man standing near a fast moving train may fall___________?
Correct answer: C. Towards the train
- A. On the train
- B. Away from the train
- C. Towards the train
- D. On himself
Explanation
Air moves rapidly in the narrow region beside the train, so Bernoulli's principle gives lower pressure there than on the other side of the person. The greater pressure away from the train pushes the person towards it; the common mistake is choosing away from the train by assuming fast air produces greater pressure.
Last updated
About Fluid Flow
Fluid flow covers pressure, density, viscosity and the motion of liquids and gases through pipes or open channels. It includes the continuity equation, Bernoulli equation, streamline and turbulent flow, and the effects of changing area, height and speed. Viscosity and ideal fluid assumptions must not be confused with pressure effects.
Practise Fluid Dynamics
363 free Fluid Dynamics MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Physics questions like this
Physics is on 13 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
A fluid is flowing through a tube. To undergo transition from laminar to turbulent flow its velocity must be:
A piece of wood and a piece of iron seem to lose the same weight when completely submerged in a liquid. The two pieces must have the same:
According to Pascal's law the pressure of gas in a vessel is
According to Pascals law the pressure of gas in a vessel is_____________?
Blood vessels are______________?