pendulum 音标拼音: [p'ɛndʒələm]
n . 钟摆,摇锤
钟摆,摇锤
pendulum n 1 :
an apparatus consisting of an object mounted so that it swings freely under the influence of gravity Hydrometer \
Hy *
drom "
e *
ter \,
n . [
Hydro -,
1 -
meter :
cf .
F .
hydrom [`
e ]
tre .]
1 . (
Physics )
An instrument for determining the specific gravities of liquids ,
and thence the strength spirituous liquors ,
saline solutions ,
etc .
[
1913 Webster ]
Note :
It is usually made of glass with a graduated stem ,
and indicates the specific gravity of a liquid by the depth to which it sinks in it ,
the zero of the scale marking the depth to which it sinks in pure water .
Extra weights are sometimes used to adapt the scale to liquids of different densities .
[
1913 Webster ]
2 .
An instrument ,
variously constructed ,
used for measuring the velocity or discharge of water ,
as in rivers ,
from reservoirs ,
etc .,
and called by various specific names according to its construction or use ,
as {
tachometer },
{
rheometer }, {
hydrometer }, {
pendulum },
etc .;
a current gauge .
Hydrometric
Pendulum \
Pen "
du *
lum \,
n .;
pl . {
Pendulums }. [
NL .,
fr .
L .
pendulus hanging ,
swinging .
See {
Pendulous }.]
A body so suspended from a fixed point as to swing freely to and fro by the alternate action of gravity and momentum .
It is used to regulate the movements of clockwork and other machinery .
[
1913 Webster ]
Note :
The time of oscillation of a pendulum is independent of the arc of vibration ,
provided this arc be small .
[
1913 Webster ]
{
Ballistic pendulum }.
See under {
Ballistic }.
{
Compensation pendulum },
a clock pendulum in which the effect of changes of temperature of the length of the rod is so counteracted ,
usually by the opposite expansion of differene metals ,
that the distance of the center of oscillation from the center of suspension remains invariable ;
as ,
the {
mercurial compensation pendulum },
in which the expansion of the rod is compensated by the opposite expansion of mercury in a jar constituting the bob ;
the {
gridiron pendulum },
in which compensation is effected by the opposite expansion of sets of rods of different metals .
{
Compound pendulum },
an ordinary pendulum ; --
so called ,
as being made up of different parts ,
and contrasted with {
simple pendulum }.
{
Conical pendulum }
or {
Revolving pendulum },
a weight connected by a rod with a fixed point ;
and revolving in a horizontal circle about the vertical from that point .
{
Pendulum bob },
the weight at the lower end of a pendulum .
{
Pendulum level },
a plumb level .
See under {
Level }.
{
Pendulum wheel },
the balance of a watch .
{
Simple pendulum }
or {
Theoretical pendulum },
an imaginary pendulum having no dimensions except length ,
and no weight except at the center of oscillation ;
in other words ,
a material point suspended by an ideal line .
[
1913 Webster ]
69 Moby Thesaurus words for "
pendulum ":
Indian file ,
array ,
articulation ,
bank ,
buzz ,
catena ,
catenation ,
chain ,
chain reaction ,
chaining ,
concatenation ,
connection ,
consecution ,
continuum ,
course ,
cycle ,
descent ,
drone ,
endless belt ,
endless round ,
file ,
filiation ,
gamut ,
gradation ,
hum ,
line ,
lineage ,
metronome ,
monotone ,
nexus ,
oscillator ,
periodicity ,
plenum ,
powder train ,
progression ,
queue ,
range ,
rank ,
recurrence ,
reticulation ,
rocker ,
rocking chair ,
rocking stone ,
rotation ,
round ,
routine ,
row ,
run ,
scale ,
seesaw ,
sequence ,
series ,
shuttle ,
shuttlecock ,
single file ,
spectrum ,
string ,
succession ,
swath ,
swing ,
teeter ,
teeter -
totter ,
teeterboard ,
teetery -
bender ,
thread ,
tier ,
train ,
vibrator ,
windrow
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Pendulum - Wikipedia When a pendulum is displaced sideways from its resting, equilibrium position, it is subject to a restoring force due to gravity that will accelerate it back toward the equilibrium position When released, the restoring force acting on the pendulum's mass causes it to oscillate about the equilibrium position, swinging back and forth
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Pendulum (mechanics) - Wikipedia Animation of a pendulum showing the velocity and acceleration vectors A pendulum is a body suspended from a fixed support that freely swings back and forth under the influence of gravity
Pendulum | Definition, Formula, Types | Britannica pendulum, body suspended from a fixed point so that it can swing back and forth under the influence of gravity Pendulums are used to regulate the movement of clocks because the interval of time for each complete oscillation, called the period, is constant
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Physics of a Pendulum: Types, Formulas, History Applications Pendulum is a simple way to show what periodic motions are like They may be as simple as a simple pendulum and more complex like Foucault’s pendulum or compound pendulum
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Simple Pendulum - Physics, Formulas, and Applications Learn about the simple pendulum, its physics, real-world behavior, and calculations Ideal for high school and college physics students