It is useful as it contains all the force balances that drive the wind in a free atmosphere (frictionless) in a synoptic scale feature. Deriving the frictional component is unnecessarily expensive. Note, since this question is in "Hurricanes Typhoons and Cyclones", be careful not to use geostrophic wind equation for winds around these features. The Rossby radius is too large, and you are better off using gradient wind balance.
yes
16 km is a good approximation.
plot
near zero
3 or 3.142
The death of jesus is observed by christians the world over on good Friday.
Look at the can. If it indicates 10 oz, then that's a good approximation.
Yes - that is a very good approximation. A mile is about 1.6 kilometers.
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you need to have good balance on the beam or else you will fall off.
It varies - but up to 45 minutes is a good approximation.
Approx: 6*20 = 120 Fact: 5.7*19.4 = 110.58