• Is time travel possible?

    14 answers · 2 days ago
  • What causes size?

    13 answers · 5 days ago
  • What's the scientific answer for 'If a tree falls in the forest, and nobody is there, does it make a sound?'?

    What would scientist's say, yes or no? I'd personally say yes as since sound always has a medium on Earth to travel through, even if nobody is there it still would.
    What would scientist's say, yes or no? I'd personally say yes as since sound always has a medium on Earth to travel through, even if nobody is there it still would.
    8 answers · 2 days ago
  • What is the Archimedes’ Principle?

    Best answer: Watch this
    Best answer: Watch this
    6 answers · 1 day ago
  • Is climate change real?

    Best answer: Take a look at history of recorded information i personally remember having ice rinks every year for weeks now it barely gets cold enough to freeze for a day two


    That alone only happened in 40 years time


    I wonder what the changes are over centuries or milenia
    Best answer: Take a look at history of recorded information i personally remember having ice rinks every year for weeks now it barely gets cold enough to freeze for a day two


    That alone only happened in 40 years time


    I wonder what the changes are over centuries or milenia
    20 answers · 5 days ago
  • I’ve asked this question 3 times I am thankful for the helpful equations but can somebody please give me the correct answer!!😭😩?

    A 5.4 g bullet leaves the muzzle of a rifle with a speed of 523.4 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the rifle? Answer in units of N.
    A 5.4 g bullet leaves the muzzle of a rifle with a speed of 523.4 m/s. What constant force is exerted on the bullet while it is traveling down the 0.5 m length of the barrel of the rifle? Answer in units of N.
    5 answers · 23 hours ago
  • In that circuit what is the equivalent resistance considering the current conventional?

    In that circuit what is the equivalent resistance considering the current conventional?

    I calculated it 9.3 ohm am I right?
    I calculated it 9.3 ohm am I right?
    6 answers · 2 days ago
  • Please help with physics? Thank you?

    A 63.9 kg water skier is pulled by a 125 N force at a 31.5° angle, while the water creates a 84.8 N force pulling directly backward. What is the x-component?
    A 63.9 kg water skier is pulled by a 125 N force at a 31.5° angle, while the water creates a 84.8 N force pulling directly backward. What is the x-component?
    4 answers · 9 hours ago
  • What is the outward pull when spinning something in a circle?

    Best answer: If you are being precise... The outwards force you feel (call it X) is neither the centripetal nor the (fictitious) centrifugal force. Centripetal force is the force *on the object* which makes it move in a circle. In your example X is a force on you, not on the rotating object Centrifugal force is the... show more
    Best answer: If you are being precise...

    The outwards force you feel (call it X) is neither the centripetal nor the (fictitious) centrifugal force.

    Centripetal force is the force *on the object* which makes it move in a circle. In your example X is a force on you, not on the rotating object

    Centrifugal force is the fictitious (apparent) outwards force experienced by an object that is in a rotating frame of reference. E.g. if you are in a car going round a bend it *feels* like there is a radially outwards force on you.

    In your example you are not in a rotating frame of reference. So X is not centrifugal force.

    The tension in the string results in forces at the end of the string directed like this:
    >---------<

    The centripetal force is the tension at the end of the string where the object is attached,

    X is the tension at the end of the string you are holding. X does not have a special name but it is equal in magntiude and opposite in direction to the centripetal force applied to the rotating object. (And it is equal in magnitude and direction to the fictitious centrifugal force which the object experiences in its own frame of reference.)
    4 answers · 9 hours ago
  • When was the hydrogen bomb dropped?

    5 answers · 2 days ago
  • Why were thermionic devices/vacuum tubes unreliable?

    Best answer: Heat, overall power use, size, manufacturing cost and high voltage requirements were (and are) the main problems. A portable device had to have two batteries; a relatively large low voltage one for the valve [tube] filaments plus a high voltage one for the actual electronics. Some gear also had a third... show more
    Best answer: Heat, overall power use, size, manufacturing cost and high voltage requirements were (and are) the main problems.
    A portable device had to have two batteries; a relatively large low voltage one for the valve [tube] filaments plus a high voltage one for the actual electronics. Some gear also had a third "bias" battery.


    Reliability was not really all that much of a problem as the equipment they were in was usually designed for easy valve replacement. Other components often caused as many reliability problems as the valves themselves.

    Early valves were not that good as the techniques needed for them to work well and have a long life were still being developed.

    Later manufacturing techniques vastly improved reliability and some gear used miniature valves that had thin flexible leads and were soldered in place like transistors rather than plug-in style valves that need sockets.
    eg. http://www.saturn-sound.com/images%20-%2...


    Transistors are vastly smaller, take less power, do not need high voltages - and most importantly, they can be mass-produced; a single silicon wafer can contain thousands of individual transistors or millions to billions of transistors as part of integrated circuits.
    4 answers · 15 hours ago
  • Physics Problem please?

    What volume of water has the same mass as 120 cm^3 of gold?
    What volume of water has the same mass as 120 cm^3 of gold?
    4 answers · 21 hours ago
  • As you approached the center of Earth, wouldn't the gravitational force tend to infinity?

    Because then your r^2 value is tending towards 0. And what if you were at the exact center in a perfect sphere? Of course, the gravitational force is 0, but how can you mathematically prove that using newton's gravitational equation?
    Because then your r^2 value is tending towards 0. And what if you were at the exact center in a perfect sphere? Of course, the gravitational force is 0, but how can you mathematically prove that using newton's gravitational equation?
    10 answers · 5 days ago