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1. Under certain conditions, the maximum force F exerted by an incoming tsunami

ID: 2828572 • Letter: 1

Question

1. Under certain conditions, the maximum force F exerted by an incoming tsunami upon an

object near the shore can be predicted from its initial amplitude a and its initial steepness k

by F = ca2k3/2, where c is a constant. Each of the parameters a and k can in principle be

measured independently from satellite data while the wave is still far offshore.

Use calculus to estimate which of the following will give a greater percentage error in the

prediction of F: a 6% error in the measurement of a, or an 8% error in the measurement of k.

Explanation / Answer

dF/da =2f/a

dF/f=2 da/a=12%

dF/F=3/2 dK/k=12%

same error