An Umbrella Has a Tendency to Move Upward When It

question 159

Multiple Choice

An umbrella has a tendency to move upward when it is windy principally because

• A)moving air over the curved surface produces reduced pressure against its top.
• B)air moves up into the "bowl" and pushes upward with increased pressure.
• C)buoyancy increases with increasing wind speed.
• D)the umbrella is simply pushed upward by the wind.
• This effect was first accurately described by
• E)Galileo.
• F)Newton.
• G)Bernoulli.
• H)Einstein.
• I)Archimedes.