Question
Question: A half kilogram stone, tied to the end of a string of length 1.0 m, is whirled in a vertical circle ...
A half kilogram stone, tied to the end of a string of length 1.0 m, is whirled in a vertical circle with the other end of the string as the centre of the circle. If the angular frequency of the stone is 4 rad/s, what is the tension in the string when the stone is at the lowermost position of the circle ? (take g = 10 m/s2)
A
3 N
B
5 N
C
8 N
D
13 N
Answer
13 N
Explanation
Solution
Tlowest = mg + mrw2
= 21 (10) + 21 (1) (4)2 = 5 + 8 = 13N