DOC.
1
MECHANICS LECTURE NOTES
115
If the
system
is
cyclical, only
states with constant
p
are
considered,
and
H
is
a
second–
order function of the p'
(=
ti'),
the
right
hand
side vanishes.
The
same
is
true if
derived
for
a cyclical
&
a noncycl.
Examples.
1)
dP
~di
de
dp'
I
(
Lenz's
law
2)
dp
df
d
dv
dt
not correct
Pa
=
P
Pa =
dv
dt
Pu=
-
dS
dt
Pb' =
T
de
dqt
1
Peltier
--
=
-r1'
dT
di
T
Pa =
e
P.=
dS
It
£.1
dt T
dp,
=
i
dp
dt dt
Another
Derivation
of the
Fundamental
Equations
of the
Material
Point[73]
=
T
At
some place on
the
surface
of the earth
[P. 116]
let there
be
a
number of identical
weights
as
well
as a
spring.
We
suspend
from the
spring
0
1
2
...
of the
weights
in
succession,
& thus obtain the
lengths
lo, l1, l2
....
of the
spring.
We
set
the
force
exerted
by
the
weights
upon
the
spring
equal
to
the number of the
suspended
weights
and
thus
obtain
a
relative[74]
measure
of the
force
exerted
upon
the
spring.
We
postulate
that the
force
exerted
by
the
spring
upon
the
weights
is
of the
same
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