First slide

Force

Question

A 5 kg body is rotated in a vertical circle with a constant speed of 4 ms^–1 using a string of length 1 m, when the tension in the string is 31N, then the body will be

Moderate

A

at the lowest point
B

making an angle 30⁰with vertical
C

at the highest point
D

at horizontal position

Solution

Centrigugal force = mV² / r = 5X 4² / 1 N = 80 N
Weight of the body = 5 X 9.8 W = 49 N
When the body is at the highest position , T_min = mV² / r - mg = (80 - 49) N = 31 N

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