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Tension on a String, Centripetal Acceleration

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4. A boy whirls a ball on a string 1.0 m long in a horizontal circle at 50 rpm. If the mass of the ball is 0.22 kg, what is the tension in the string?

5. A jetliner traveling at 600 km/h is turning in a circle of radius 2.5 km. What is its centripetal acceleration?

6. A 4.0-kg object is lifted 1.5 m. (a) How much work is done against the Earth's gravity? (b) Repeat if the object is lowered instead of lifted

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Solution Summary

The tensions on a string using centripetal acceleration are determined.

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4. A boy whirls a ball on a string 1.0 m long in a horizontal circle at 50 rpm. If the mass of the ball is 0.22 kg, what is the tension in the string?
Solution:
Tension must be equal to the cetrepital force: T=ma, where a is a centripetal acceleration a=v^2/R.
So we have:
R=1.0 meter
to get speed you need to ...

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