单词 | pendulum |
释义 | pendulum (once / 2110 pages) n A pendulum is something hanging and swinging freely from a fixed point. A grandfather clock might use for timekeeping a pendulum that swings back and forth. Pendulum comes from the Latin word pendulous, meaning "hanging down." If someone hangs a pocket watch in front of you and swings it back and forth, saying, "You're getting very sleepy," they're mimicking the movement of a pendulum. We also use the word pendulum to describe a situation moving between two poles or across a spectrum, like the balance of power in a multiparty political system. WORD FAMILYpendulum: pendulums USAGE EXAMPLESThe work will cost £29m and involve repairs to the clock's hands, mechanism and pendulum. BBC(Dec 17, 2016) The work, which will begin early in the new year, will cost £29m and involve repairs to the clock's hands, mechanism and pendulum. BBC(Dec 16, 2016) “The pendulum, in my opinion, is already moving back to the left.” Washington Post(Dec 07, 2016) n an apparatus consisting of an object mounted so that it swings freely under the influence of gravity Hypo|Hyper Foucault pendulum pendulum with a long wire; can swing in any direction; the change in the swing plane demonstrates the earth's rotation metronomeclicking pendulum indicates the exact tempo of a piece of music compound pendulum, physical pendulumpendulum consisting of an actual object allowed to rotate freely around a horizontal axis simple penduluma hypothetical pendulum suspended by a weightless frictionless thread of constant length ballistic penduluma physical pendulum consisting of a large mass suspended from a rod; when it is struck by a projectile its displacement is used to measure the projectile's velocity clock penduluma physical pendulum used to regulate a clockwork mechanism apparatus, setup equipment designed to serve a specific function |
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