A pilot of mass m can bear a maximum apparent weight 7 times of mg. The aeroplane is moving in a vertical circle. If the velocity of aeroplane is 210m/s while driving up from the lowest point of vertical circle, the minimum radius of vertical circle should be:
375m
420m
750m
840m
A
420m
B
375m
C
750m
D
840m
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Solution
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Given maximum apparent weight is 7mg Apparent weight at the lowest point is (mg+mv2r) So, 7mg=mg+mv2r or, 6mg=mv2r or, r=v26g or, r=21026g or, r=750m So , minimum radius of circle is 750m
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