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Searching for questions in category physics

Found 774 questions. Showing results 1 to 5.

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1.	In terms of physics, why was it thought that man couldn't travel faster than the speed of sound? Was it the theory of relativity? I can't find info on this anywhere. Maybe you can help me. What was it about the physics of sound that made scientists think that man couldn't travel faster than the speed of sound?
2.	Whose decision is it that our country uses the standard system and not the metric system? I find it confusing that almost every other country uses the metric system except for the United States. Why don't we? If our country ever did switch to the metric system, who would be in charge of confirming that change?
3.	Do air particles move faster when they are under pressure?
4.	Can there be a warm/hot raindrop?
5.	Hi! Hope you guys are having a great day! I have a question involving a recent experiment that I performed: What I wanted to do was to see if I could contain water using capillary forces, etc. in a "hollow, rectangular tube" (imagine a regular straw, but then making it into a square- shaped straw, and then elongating two of the sides of that square that are parrallel to each other to create a rectangular-shaped "straw") Anyway, I wasnt able to make the shape perfect due to the materials that I was using to create the shape. But it did seem to work fairly well, althought water did begin to slowly fall out of the tube when it was in the vertical position due to some air bubbles that I thought might of formed when I was taking the entire tube out of the water. The dimensions of the rectangular part of the tube were 0.5cm by about 1in or so, so I dont think the tube was big enought to prevent the capillary forces from keeping the water in. Do you guys have any idea why the water might be dripping out of the tube? Would you guys suggest making the tube more water/air tight or making a perfect recangular shape to prevent trapping air bubbles? Or maybe making it smaller? Any info will help. Thank you guys so much!