Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 7 - Think and Solve: 47


In an ideal case, input force multiplied by input distance equals output force multiplied by output distance. The output force just balances the piano's weight. $$ (F_{in})(2 m) = (5000 N)(0.2 m)$$ $$F_{in} = 500 N$$ This is discussed on page 120.
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