Answer
Centripetal force F = $m \frac{v^{2}}{r}$.
Doubling the speed requires four times the centripetal force.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 8 - Think and Explain - Page 156-158: 80
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