The marble rolls down a track and around the loop the loop of radius R. The marble has mass m and radius r. What minimum height h must the track have for the marble to make it around the loop the loop without falling off?
A sphere has I of 2/5mr^2
From using Newton's second law, I find the critical velocity to be sqrt(gR).
Using energy conservation, I get the equation
mgh = 1/2mv^2 + 1/2IW + 2Rg

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The horse latitudes-high-pressure zones about 30 degrees north and 30 degrees south of the equator.-warm air traveling away from the equator cools and sinks-weather tends to be clear and drythe doldrums-low-pressure near equator-air rises and spreads out toward the poles-rising moist air produces clouds and heavy rainthe westerlies-blow from the west-move from the horse latitudes toward the poles.-bring storms across much of the united statesthe tradewinds-blow from the east-move from the horse latitudes toward the equator  -strong, steady winds