Affiliation:
1. Professor of Mechanism and Applied Mechanics in the University of Cambridge
Abstract
In 1872 the late Dr. John Hopkinson published an investigation into the effect of a blow delivered by a falling weight on the lower and free end of a wire, the upper end of which is fixed. It is unnecessary to repeat the mathematical analysis in full, but its main features appear in the following argument:—As soon as the weight strikes the stop at the lower end a wave of extension starts up the wire, and the velocity with which it is propagated is √E/
ρ
=
a
, where E is Young’s modulus, and
ρ
the density of the wire. At a time
t
after the weight has struck, so short that its velocity is not appreciably diminished, the lower end of the wire has moved through a distance
Vt
, where
V
is the velocity of the weight immediately after striking.
Subject
General Earth and Planetary Sciences,General Environmental Science
Cited by
97 articles.
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