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
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