An 80cm plate of 500g mass is hinged along one side. if air is blown over the upper surface only, what speed must the air have to hold the plate horizontal?

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

compass can be used day and night, cloudy or sunny