• How do solar sails work?

    I know what you are going to say, “google it”. But according to google, solar sails work by harnessing the light. each particle of light has momentum, and it uses these to accelerate. but i thought that momentum was equal to mass times velocity, and according to the laws of physics and einstein’s law of relativity,... show more
    I know what you are going to say, “google it”. But according to google, solar sails work by harnessing the light. each particle of light has momentum, and it uses these to accelerate. but i thought that momentum was equal to mass times velocity, and according to the laws of physics and einstein’s law of relativity, photons have no mass? therefore their momentum is 0 because 0 times the speed of light is 0? i am confused, am i missing something?
    11 answers · 11 hours ago
  • Are Californians looking forward to their new severe water-use restrictions coming just FOUR years from now?

    They can't be too worried about the impact, since Moonbeam is still pouring more $billions into their bullet train to nowhere.
    They can't be too worried about the impact, since Moonbeam is still pouring more $billions into their bullet train to nowhere.
    6 answers · 2 hours ago
  • Why did Einstein multiply the speed of light by itself (c)?

    cause he said it himself , if you travel faster than light you 're gonna be bending Time . which is not possible . so what is he hiding by going faster than light only for himself ?
    cause he said it himself , if you travel faster than light you 're gonna be bending Time . which is not possible . so what is he hiding by going faster than light only for himself ?
    7 answers · 1 day ago
  • Is infrared harmful to human body?

    Best answer: No. Infrared is safe, but one must be careful not to get too warm, as in direct sunlight on a hot day.
    Best answer: No. Infrared is safe, but one must be careful not to get too warm, as in direct sunlight on a hot day.
    9 answers · 5 days ago
  • If 'infinity' is for real, isn't it possible to go the other way, as in just 1 grain of our sand may contain millions of universe?

    If 'infinity' is for real, isn't it possible to go the other way, as in just 1 grain of our sand may contain millions of universe?

    Best answer: They only turned me upright today but yes indeed You see I believe that Infinity is Infinity They say Blck Holes are singularities of Infinite Mass But how could anything that stops be infinite The same goes for the Big Bang Something happened to cause it My favourite quip is that it was a Quark of Nature Nature of... show more
    Best answer: They only turned me upright today but yes indeed
    You see
    I believe that Infinity is Infinity
    They say Blck Holes are singularities of Infinite Mass
    But how could anything that stops be infinite
    The same goes for the Big Bang
    Something happened to cause it
    My favourite quip is that it was a Quark of Nature
    Nature of course, how does a seed germinate or a Sperm Give fertilise an Egg
    Not God anyway
    9 answers · 3 days ago
  • How will radio waves effect human body?

    Best answer: Radio waves have a large wavelength from 3 meters to more than a kilometer. Therefore the energy transferred to the human body during its passage is low. However, near the transponders used for cellphones, the energy is high and so a distance of separation must be maintained to prevent any harm to the body caused... show more
    Best answer: Radio waves have a large wavelength from 3 meters to more than a kilometer. Therefore the energy transferred to the human body during its passage is low. However, near the transponders used for cellphones, the energy is high and so a distance of separation must be maintained to prevent any harm to the body caused by microwaves.
    5 answers · 1 day ago
  • How deep could an ocean get without breaking any of the laws of physics of the known observed understood universe?

    Could there be an ocean hundreds of miles or even hundreds of thousands of miles deep or even a few light seconds deep?
    Could there be an ocean hundreds of miles or even hundreds of thousands of miles deep or even a few light seconds deep?
    9 answers · 6 days ago
  • Is Weight the force of the Earth on a body or the force of a body on the Earth?

    I know that weight is the force of the Earth's gravity on a body but is it a force of the body on the earth or vice versa?
    I know that weight is the force of the Earth's gravity on a body but is it a force of the body on the earth or vice versa?
    6 answers · 2 days ago
  • Is it true that we are all constantly being watched by sattelittes and if you kill someone on the streets you will get caught by the camera?

    Best answer: No. Or you would be hearing daily about cases that are won using images from space. Car jacks, muggings, DUI's, etc should all be seen from space if such surveillance was going on. There are many cases that are solved using cameras, but they are security cameras, ATM cameras, traffic cameras, etc., that... show more
    Best answer: No. Or you would be hearing daily about cases that are won using images from space. Car jacks, muggings, DUI's, etc should all be seen from space if such surveillance was going on.

    There are many cases that are solved using cameras, but they are security cameras, ATM cameras, traffic cameras, etc., that are all land based.

    It is possible to get surveillance at any place on earth. But there are not enough cameras in space to have them running everywhere at every moment.
    6 answers · 2 days ago
  • The weight of an object is _______________ of its state of motion.?

    independent or dependent?
    independent or dependent?
    5 answers · 1 day ago
  • Does kinetic energy start zero?

    6 answers · 2 days ago
  • Why do people choose to use radio waves for cell phone information transferring,?

    Best answer: Radio waves disperse evenly over long distances. Infrared is blocked by walls. x-ray and gamma rays are destructive.
    Visible light is seen by our eyes, so we do not need a cellphone to decode it. Am I right??
    Best answer: Radio waves disperse evenly over long distances. Infrared is blocked by walls. x-ray and gamma rays are destructive.
    Visible light is seen by our eyes, so we do not need a cellphone to decode it. Am I right??
    9 answers · 5 days ago
  • If a fly collides head-on with a railway train, the fly changes direction and must momentarily be stationary. So does it stop the train?

    A fly flying towards a railway locomotive collides with its windscreen. Its direction of travel switches from one to the polar opposite. In changing its velocity from one state to the polar opposite it follows that for an instant it must have been stationary. Since the fly was in contact with the locomotive when... show more
    A fly flying towards a railway locomotive collides with its windscreen. Its direction of travel switches from one to the polar opposite. In changing its velocity from one state to the polar opposite it follows that for an instant it must have been stationary. Since the fly was in contact with the locomotive when its velocity changed, did it therefore cause the locomotive to momentarily stop in its tracks?
    7 answers · 5 days ago
  • What can I do to understand my physics professor better?

    I have a B I don't understand a word she says though. I have to go to other places to get the subject. If I could I wouldn't go to her class except to take tests and quizzes.
    I have a B I don't understand a word she says though. I have to go to other places to get the subject. If I could I wouldn't go to her class except to take tests and quizzes.
    9 answers · 6 days ago
  • What unwanted energy transfer happens in a door hinge?

    Best answer: Coverting kinetic energy into heat energy. Heat energy is most unwanted energy.
    Best answer: Coverting kinetic energy into heat energy. Heat energy is most unwanted energy.
    4 answers · 3 days ago
  • A ball thrown horizontally at 26 m/s travels a horizontal distance of 51 m before hitting the ground.?

    Best answer: So the QUESTION was "A ball is thrown HORIZONTALLY with a velocity of 26m/s. It travels a horizontal distance of 51 m before hitting the ground. ( statements of fact ). What is the height from which the ball is thrown? (the missing question). Neglect air resistance( statement of limiting conditions). ... show more
    Best answer: So the QUESTION was "A ball is thrown HORIZONTALLY with a velocity of 26m/s. It travels a horizontal distance of 51 m before hitting the ground. ( statements of fact ). What is the height from which the ball is thrown? (the missing question). Neglect air resistance( statement of limiting conditions). Use g = 9.8 m/s^2 ( gravity varies so this sets the values for your location) "

    Time of flight = d/v
    = 51/26 s

    Vertically the motion is h = 1/2 g t^2
    = 1/2 * 9.8 * ( 51 / 26 )^2 = 18.9 m
    4 answers · 4 days ago