a) We consider a system with kinetic energy T' 5Li mi q;, and coISiuel potential that admits the following scaling V' = µª X® V Show that the EOM are then invariant when one rescales time as T = µ(l-a)/2 1(2-B)/2 for the discussion of the EOM. ||
a) We consider a system with kinetic energy T' 5Li mi q;, and coISiuel potential that admits the following scaling V' = µª X® V Show that the EOM are then invariant when one rescales time as T = µ(l-a)/2 1(2-B)/2 for the discussion of the EOM. ||
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:a) We consider a system with kinetic energy T = ; £;m; ġ, and consider a
potential that admits the following scaling
V' = µª X® V
Show that the EOM are then invariant when one rescales time as
-= µ(l-a)/2 1(2-8)/2
Remark: Assume energy conservation for the discussion of the EOM.
b) Consider now two pendulums, V = mgz with different masses and length of
the pendulum arms. Which factors T, X, and µ relate their trajectories? How
will the periods of the pendulums thus be related to the ratio of the mass and
the length of the arms? Which scaling do you expect based on a dimensional
analysis?
What do you find for the according discussion of the periods of a mass attached
to a spring, V =
k|q?/2?
d) Discuss the period of the trajectories in the Kepler problem, V = –mMG/|q|.
In this case the dimensional analysis is tricky because the masses of the sun and
of the planet appear in the problem. What does the similarity analysis reveal
about the relevance of the mass of the planet for Kepler's third law?
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