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In a circus , the diameter of globe of d...

In a circus , the diameter of globe of death is 20 m . From what minimum height must a motor cyclist start in order to go around the globe successfully ? .

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Here , ` r = (20)/(2) m = 10 m , h = ? `
On rolling down the incline ,
Loss in PE . = Gain in K . E
` mgh = (1)/(2) m upsilon^(2) :. upsilon = sqrt(2 gh) `
For looping the loop , minimum velocity at the
lowest point ` = sqrt (5 gr ) `
`:. sqrt( 5 gr )= sqrt(2 gh ) `
` h = (5)/(2) r = (5)/(2) xx 10 = m` .
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