Physics
NULL
Medium
Question
A stone is whirled in a vertical circle at the end of a string. When the stone is at the highest position the tension in the string is______________?
A
Maximum
B
Zero
✓ Official correct answer
C
Equal to the weight of the stone
D
Less than the weight of the stone
Community credibility
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A
Maximum
No member explanations yet for this option.
B
Zero
No member explanations yet for this option.
C
Equal to the weight of the stone
No member explanations yet for this option.
D
Less than the weight of the stone
No member explanations yet for this option.
Explanation
At the highest point of a vertical circle, for the critical (minimum) speed case, gravity alone supplies the centripetal force, so the tension in the string is zero.
So the correct answer is Zero.
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