A stone of mass 1 kg is tied at one end of a string of length 1 m . It is whirled in a vertical circle at a constant speed of 4 m s - 1 . The tension in the string is 6 N when the stone is at ( g = 10 m s - 2 )

Question

A stone of mass 1 kg is tied at one end of a string of length 1 m . It is whirled in a vertical circle at a constant speed of 4 m s - 1 . The tension in the string is 6 N when the stone is at ( g = 10 m s - 2 ), Top of the circle, Bottom of the circle, Half way down, None of these

MARKS App · Accepted Answer

When the string makes an angle θ with the vertical, then T - m g c o s θ = m v 2 r Substituting the values, we obtain 6 - 1 1 0 cos θ = 4 2 . 1 1 = 16 cos θ = - 1 θ = 1 8 0 o

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