What is Unknowns: Definition and 155 Discussions

The Tomb of the Unknown Soldier is a monument dedicated to deceased U.S. service members whose remains have not been identified. It is located in Arlington National Cemetery in Virginia, United States. The World War I "Unknown" is a recipient of the Medal of Honor, the Victoria Cross, and several other foreign nations' highest service awards. The U.S. Unknowns who were interred are also recipients of the Medal of Honor, presented by U.S. presidents who presided over their funerals. The monument has no officially designated name.

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  1. D

    Finding The Identity of Unknowns

    For my chem class my teacher is going to give us 2 unknowns and we have to find out their identity. How would you do this? I figured that you would heat the liquids to figure out their boiling point and then look in the book (she'll let us use the books) to figure out the substaNce. I...
  2. P

    Solving for two unknowns in a 2-D elastic collision. HELP

    Hey everyone. I am really stuck on a problem that seems simple but I just can't figure it out. The problem goes as follows. There is a collision between two pucks on an air-hockey table. Puck A has a mass of 0.039 kg and is moving along the x-axis with a velocity of +5.5 m/s. It makes a...
  3. A

    Solving Velocity Problem: Need Help with Unknowns

    Hello, everyone. I'm new here, drawn by a velocity problem that's had me going in circles for two days. If someone could tell me how to set this up/proceed with solving, that'd be great. "On a car trip, you want to have an average velocity of 90km/h. Over the first half of the trip, you...
  4. C

    Need help solving equations in mechanics class?

    I'm in a mechanics\statics class and have run across a couple of problems that I cannot, for the life of me, remember how to solve. The problems end up solving for two unknowns with two equations and one of the equations has Constant = Constant Sin(theta) + another constant Cos(theta) and...
  5. wolram

    Exploring the Unknowns of the Universe: The Constant Quest for Answers

    we don't know what gravity is yet we can calculate its effects we don't know what a photon is yet we say c is limit we don't know how big our universe is yet we predict that it will continue to expand we don't know what dark matter is yet we predict it exists we don't know what a singularity...
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