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When the weight of the ball inside a ball mill is just balanced by the centrifugal force, the ball

When the weight of the ball inside a ball mill is just balanced by the centrifugal force, the ball Correct Answer abandons its circular path for a parabolic path

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When the weight of a ball inside the ball mill is just balanced by the centrifugal force,
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There are seven persons - A, B, C, D, E, F and G. They have different weights. The weight of second heaviest person is 185 kg and the weight of second lightest person is 85 kg. Sum of weight of C and D is 290 kg. Only Three persons have more weight than D. E is heavier than both F and G but F is not lightest. The weight of A is 250 kg. Sum of weight of F and G is 135 kg. B is heavier than both C and D but C is not lightest. The weight of D is 140 kg. The weight of E is obtained from removing weight of C from weight of A. Who is the Fourth lightest person? 
There are seven persons - A, B, C, D, E, F and G. They have different weights. The weight of second heaviest person is 185 kg and the weight of second lightest person is 85 kg. Sum of weight of C and D is 290 kg. Only Three persons have more weight than D. E is heavier than both F and G but F is not lightest. The weight of A is 250 kg. Sum of weight of F and G is 135 kg. B is heavier than both C and D but C is not lightest. The weight of D is 140 kg. The weight of E is obtained from removing weight of C from weight of A. Who is the fifth heaviest person? 
Weight of Alok is twice the weight of Karan. Weight of Karan is one-fourth of the weight of Roma. Weight of Roma is twice of the weight of Tipu. Weight of Tipu is twice of the weight of Shivam. The weight of Roma is greater than the weight of how many persons among Alok, Karan, Shivam and Tipu?
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The average weight of a group of 10 girls is 48 kilograms. If 2 girls R and S, replace by P and Q then the new average weight is 46 kg. The weight of P is equal to the weight of Q and the weight of R is equal to the weight of S, another girl T joins the group and the new average weight of the group becomes 46 kg. The weight of T is equal to the weight of P. What is the weight (in kg) of R?
The average weight of a group of 12 girls is 48 kg. If 2 girls R and S replace P and Q, the new average weight becomes 46 kg. The weight of P = the weight of Q. The weight of R = the weight of S. Another girl T, is included in the group and the new average weight becomes 46 kg. The weight of T = the weight of R. What is the weight of P (in kg)?
Weight of Alok is twice the weight of Karan. Weight of Karan is one-fourth of the weight of Roma. Weight of Roma is twice of the weight of Tipu. Weight of Tipu is twice of the weight of Shivam. The weight of Roma is greater than the weight of how many persons among Alok, Karan, Shivam and Tipu?