D. Name the following: 1. ratio between the force and the area of surface 2. the SI unit of thrust 3. the envelope of air surrounding the Earth 4. the turning effect of force about a pivot5. The measured value of atmospheric pressure on the surface of the Earth is ________
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1= Because p = F / A , all units of pressure represent some ratio of force to surface area. The principle SI unit is called a pascal (Pa), or 1 N/
2= It is vector quantity and SI Unit of thrust is Newton
3= The atmosphere is a gaseous envelope surrounding the earth
4= The turning effect of a force is called the moment of the force
5= The standard, or near-average, atmospheric pressure at sea level on the Earth is 1013.25 millibars, or about 14.7 pounds per square inch.
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