A rubber stopper is swung in a horizontal circle at the end of a string

PHYSICS · Subjective · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

0.60\,\text{kg}

rubber stopper is swung in a horizontal circle at the end of a

1.5\,\text{m}

string. The path radius of the stopper is

1.4\,\text{m}

. If the string will break when the tension exceeds

40\,\text{N}

, determine the greatest speed the stopper can have without the string snapping. Express your answer to two significant figures.