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Everything posted by noxid

  1. cubesat, But what want to know is there a non-contact temperature sensor aviailable? That works at a distance of meters at least
  2. Hello. I am working on a project to build a model satelite with some functionality. Communications, Payload Sensors, Attitude sensing, robotic arm, solar panel and a simulated RCS. We are restricted to low budget and i would like to know what types of sensors (arduino, raspberry pi compatible) we could use to measure e.g. prescence of certain chemicals-->spectrograh and magnetic field, eath's surface relief etc.
  3. Can i create a plasma channel using a van de graff generator etc to conductive like a wire? What is the conductivity of plasma in air-> links to previous research appreciated
  4. I have read that xenon reacts
  5. Is radon toxic because it is radioactive or because it is chemically active?
  6. Since gravity can be described as a curvature in spacetime, can other forces like EM, Weak, Strong etc? Be described similarly
  7. http://www.sciencealert.com/new-study-confirms-physicists-might-have-spotted-a-fifth-force-of-nature Heard news of a possible fifth force of nature, seeking more deatailed information on the subject matter
  8. noxid


    Kind of a basic question, but doesnt the fact that it always measures the same make it the perfect datum, please correct my misconception
  9. noxid


    since light speed is a constant why dont we measure velocity relative to it
  10. noxid


    does a velocity of zero exits in the universe, or any velocity apart from the speed of light, since everything is relative to something else, how can i say i am moving faster or slower than another object with confidence?
  11. If they speed increase, wont that translate into a force that pushes them to the tail
  12. Doesnt it become harder and harder to maintain a 1 G acceleration as c is approached assumig we have an intial velocity of 0 (whatever that is), there are 31557600 seconds in a year, multiply that by the acceleration, which is 9.80665m/s^2 and we get 309,264,480 ms-1, so we kept moving at g for 1 year we would be moving faster than light, which it seems regrettably is impossible, so can we really travel at g for 400+
  13. Does this take into account deceleration at midway point?
  14. According to relativity, gravitational fields cause time dilation effects, lets say for instance i have a 'magic' device that can generate gravitational fields Is it possible that this can be used to slow down one's time so as to make the journey seem much shorter
  15. So basically i take a long time to throw, the bag i i experience less force, explain... give me a scenario where t is short vs where it is long ie. how can i throw the bag to achieve different t
  16. F=ma, so, F=62*(53-0)/t, where 53 is the final velocity of the bag relative to me, but i am not sure what t should be
  17. lets say i am 62Kg and my velocity just before hitting the ground is 53m/s, about the terminal velocity of a person then the total momentum of me and the bag is 62*2 *53=6572 Kgm/s, i throw the bag at 106 m/s at the ground. So its momentum is 106*53=6572 and my resulting momentum is zero, due to v=0 in p=mv Since force, F=ma, and my acceleration here is zero, i should experience no force, shouldnt I?
  18. Could the observed missing mass of the universe/galaxies be a result of unobserved black holes or other dense but faint objects
  19. Lets say i am falling from a great height, and i am wearing a bag that is the same mass as me, and just before i hit the ground i throw the bag at the ground at a velocity (w.r.t. the ground) twice that which i am falling relative to the ground. Would i survive?
  20. It may be unrealistic in terms of scale/size but the concept is hard science, this is what a thought experiment is
  21. Good point, however what i was mostly trying to get at was whether or not their will be a pressure gradient that would be set up from the outer to the inner walls, regardless do you think the astronaut will basically stay in the same position now that i think about it, wasnt this how ringworld keep its atmosphere
  22. they would both obviously tend to fall to the, floor, but i think what i am talking about is different imaging there is an astronaut in space at constant velocity, now suddenly place the tube structure around him with the center of the tube(center of rotation) moving at a velocity equal to that of the astronaut,i think if there is no air, it is safe to say the astronaut will not be influenced by the doughnut structure (assume it has no mass). Now if when it appeared around the astronaut it was filled with air, the air would tend toward the outer edge of the tube........... Now that i think about it air currents may be set up in the direction of motion of the rotation, that will push the astronaut towards the outer wall,.....lets assume the inner walls are smooth...what i want to explore is the centrifugal effects on the air,not the push of the inner walls on the air, the air having less mass and lower density would be much more readily accelerated than the astronaut and so collects a lot quicker on the outer walls creating a pressure differential with a higher pressure at the outer walls, which may or may not be enough to push the astronaut opposite
  23. yeah but you are not touching the sides of the tube besides, if the air immediate to the outer edge of tube gets accelerated, i think it would tend to 'stick' to the inner wall of the outer edge, creating a partial vacuum that pull even more air towards this edge. Overtime, it would create a higher pressure of fluid at the outer edge which would tend to push any object towards to inner edge
  24. wouldnt the air tend to collect at the outer edge, therefore shouldnt i drift towards the center
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