• How real is time travel?

    15 answers · 1 day ago
  • If it possible, hypothetically, for an object to go faster than light while falling into an infinite gravity field?

    Since the object accelerates in gravity.
    Since the object accelerates in gravity.
    10 answers · 23 hours ago
  • Does an object slow down when it changes directions?

    An object accelerates when changes speed and also when it changes directions, so is it reasonable to assume the act of changing directions slows the object down? For example, an object travels north at 5m/s and then turns to north east It decelerates?
    An object accelerates when changes speed and also when it changes directions, so is it reasonable to assume the act of changing directions slows the object down? For example, an object travels north at 5m/s and then turns to north east It decelerates?
    8 answers · 2 days ago
  • Why are we involved in destroying each other, instead of helping to learn how to get off this planet in time?

    Best answer: We are not yet a form of intelligent life.
    Best answer: We are not yet a form of intelligent life.
    5 answers · 15 hours ago
  • Not true,OR IS IT? YOU CAN start a fire by rubbing sticks together? No porky's now. ;-)?

    Best answer: It's a skill that can be developed to start a fire, yes. The act of rubbing (usually by rotating a sharpened stick to and fro rapidly while pushing down into a small hole in another stick) produced frictional heating. By having some fine dried grass or similar around the hole close to the hot point, it is... show more
    Best answer: It's a skill that can be developed to start a fire, yes. The act of rubbing (usually by rotating a sharpened stick to and fro rapidly while pushing down into a small hole in another stick) produced frictional heating. By having some fine dried grass or similar around the hole close to the hot point, it is possible to eventually get that grass to smoulder. By gently blowing on the smouldering mass, with care the grass will break into fire. The fire is then used to start more grass burning, then by adding small sticks you can get them to burn. Little by little larger sticks are added, until you have enough fire to even ignite logs.
    All done because of the heat produced by friction.
    10 answers · 4 days ago
  • Is gravitational acceleration zero at the central region of the black hole?

    Best answer: No. Because all the mass of a Black Hole is concentrated at the geometric center of the Black Hole. ie A Black Hole has all its' mass concentrated at a point of zero volume. Matter with volume surrounding that point is attracted to the point by gravity.
    Best answer: No. Because all the mass of a Black Hole is concentrated at the geometric center of the Black Hole. ie A Black Hole has all its' mass concentrated at a point of zero volume. Matter with volume surrounding that point is attracted to the point by gravity.
    9 answers · 4 days ago
  • Atheists, at what height does the 'vacuum of space' begin? Does it make logical sense that a vacuum and an atmosphere are side by side?

    with no physical barrier between them?
    with no physical barrier between them?
    20 answers · 6 days ago
  • What are atoms made out of?

    And what is whatever atoms are made out of, made out of? And what are those teeny tiny things made out of? All the way down the line, what is the ultimate tiny part that is the base of reality? BQ:Why does the universe exist?
    And what is whatever atoms are made out of, made out of? And what are those teeny tiny things made out of? All the way down the line, what is the ultimate tiny part that is the base of reality? BQ:Why does the universe exist?
    19 answers · 1 week ago
  • Is it possible to find acceleration with only one velocity provided?

    Say you have a question that is asking for the acceleration of a single velocity - lets say 10m/s. How would you find the acceleration, provided you have only one velocity?
    Say you have a question that is asking for the acceleration of a single velocity - lets say 10m/s. How would you find the acceleration, provided you have only one velocity?
    6 answers · 3 days ago
  • Is there really anything such as "solid" matter -- or is it just "forces"?

    Best answer: Certainly, there is very little "solid" in matter. It is suspected that there is nothing solid at all. But we really do not know. Atoms are made of protons and neutrons in a central area surrounded by electrons. That already means a huge amount of space in solid matter. But protons and neutrons are... show more
    Best answer: Certainly, there is very little "solid" in matter.
    It is suspected that there is nothing solid at all.

    But we really do not know.
    Atoms are made of protons and neutrons in a central area surrounded by electrons.
    That already means a huge amount of space in solid matter.

    But protons and neutrons are supposedly made of 3 quarks. If quarks are similar to protons, then there is another even tinier bit of solid surrounded by more space. And in any case, quarks are so small as to be almost non existent, and are possibly just energy.

    That is a currently unresolved question in astronomy. Astrophysicists think there aught to be (or might be) quark stars. But so far there is no evidence that quark stars exist.

    And hence the question of what quarks are made of remains an open question.
    Read this for more info
    https://en.wikipedia.org/wiki/Quark_star
    8 answers · 4 days ago
  • Help understanding on finding the mass given volume and density?

    Best answer: We abandoned the imperial system some 50 years ago because all these conversions are error prone and tedious. I spend years of my primary school learning to convert bushels of wheat etc. pounds, quarters, hudredweight, tons. Long tons, short tons, bakers tons. Not to mention all those roods and perches, links and... show more
    Best answer: We abandoned the imperial system some 50 years ago because all these conversions are error prone and tedious.
    I spend years of my primary school learning to convert bushels of wheat etc.
    pounds, quarters, hudredweight, tons. Long tons, short tons, bakers tons.
    Not to mention all those roods and perches, links and chains. Furlongs and acres.

    Your method is correct
    19.3 g / cm^3 * 2.54 ^ 3 -> ~316 g / inch^3
    now you multiply by the volume of the brick NOT divide.
    density * volume -> mass
    mass = 316 * 2 * 4 * 8 = 20.24 kg

    But the answer asks for POUNDS so you need once more to find the correct definition of a pound.
    one value for the conversion is 2.20462 ( I don't know what country you are in which affects the conversion factor to be used but only to a minor extent )
    20.24 * 2.20462 = 44.6 lb
    4 answers · 2 days ago
  • Will I become horse man.?

    Best answer: Neighhhhhhhhhh!!
    Best answer: Neighhhhhhhhhh!!
    10 answers · 6 days ago
  • What is the mass of the electron when its not at rest?

    Best answer: M = Mrest + (1/2)MV^2 / C^2
    Best answer: M = Mrest + (1/2)MV^2 / C^2
    4 answers · 3 days ago
  • How to create time travel easily?

    Best answer: Just invent a time travel machine.
    Best answer: Just invent a time travel machine.
    17 answers · 1 week ago
  • If you were to drop a small pebble from a really high altitude, would it kill you?

    Best answer: It depends on the size of the pebble and it's weight. But yes, it's possible. There are incidences where someone fired a bullet up in the sky and it fell back and hit another person and killed that person.
    Best answer: It depends on the size of the pebble and it's weight. But yes, it's possible. There are incidences where someone fired a bullet up in the sky and it fell back and hit another person and killed that person.
    12 answers · 1 week ago