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Speed of sound: A pipe that is 20.0 m long and 10.0 cm in diameter contains olive oil. The density of the olive oil is 890 kg/m3 and the bulk modulus is 1.3 × 109 Pa. A 3.4-Hz longitudinal wave is transmitted in the oil. How many milliseconds does it take for the wave to travel the length of the pipe in the oil?
Tsarist Russia
The period of Russian history from the 16th century until the abdication of Tsar Nicholas II in 1917, characterized by autocratic rule.
Zimmermann Telegram
Telegram from the German foreign secretary to the German minister in Mexico, February 1917, instructing the minister to offer to recover Texas, New Mexico, and Arizona for Mexico if it would fight the United States to divert attention from Germany in the event that the United States joined the war.
Declaration of War
A formal announcement by a government or sovereign that it is in a state of war with another entity, traditionally another country or sovereign power.
Women's Suffrage
The right of women to vote in elections; a hard-won right achieved through decades of activism by suffragettes and feminists across various nations, culminating in significant legal milestones throughout the 19th and 20th centuries.
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