• If the Earth is round, why don't airplanes have to compensate for the curvature of the Earth?
  • A rubber ball is dropped from the top of a hole. Exactly 1.5 seconds​ later, it's heard hitting the bottom. How deep is the hole​?

    Best answer: The speed of sound in air is 343 m/s. During the first part of 1.5 seconds, the ball falls from the top to the bottom of the hole. During the second part of 1.5 second part of the 1.5 seconds, the sound rises from the bottom to the top of hole. Let t be the time the ball is falling and 1.5 – t be the time the sound... show more
    Best answer: The speed of sound in air is 343 m/s. During the first part of 1.5 seconds, the ball falls from the top to the bottom of the hole. During the second part of 1.5 second part of the 1.5 seconds, the sound rises from the bottom to the top of hole. Let t be the time the ball is falling and 1.5 – t be the time the sound is rising.

    For the ball, d = ½ * 9.8 * t^2 = 4.9 * t^2
    For sound, d = 343 * (1.5 – t) = 514.5 – 343 * t
    These two distances are equal.

    4.9 * t^2 = 514.5 – 343 * t
    4.9 * t^2 + 343 * t – 514.5 = 0
    t = [-343 ± √(343^2 – 4 * 4.9 * -514.5)] ÷ 9.8
    t = [-343 ± √127,733.2] ÷ 9.8
    t = [-343 + √127,733.2] ÷ 9.8

    The time is approximately 1.47 seconds.

    For the ball, d = 4.9 * (343 + √127,733.2] ÷ 9.8)^2
    The distance is approximately 10.6 meters.

    OR

    d = 514.5 – 343 * (-343 + √127,733.2] ÷ 9.8)
    The distance is approximately 10.6 meters.
    6 answers · 2 days ago
  • Is it possible for time travel to exist with the right technology?

    I've heard traveling into the future is possible but traveling back in time is really hard. One of my friends actually time traveled before so he asked me if I wanted to come next time he goes I'm a bit scared though.
    I've heard traveling into the future is possible but traveling back in time is really hard. One of my friends actually time traveled before so he asked me if I wanted to come next time he goes I'm a bit scared though.
    8 answers · 9 hours ago
  • What would happen if a nuclear power plant explodes in a small town?

    I live in a small town and they are putting in a nuclear power plant. My imagination tends to run wild so I was wondering what would happen if it explodes. Will it cause radioactive problems, or will it not cause any problem?
    I live in a small town and they are putting in a nuclear power plant. My imagination tends to run wild so I was wondering what would happen if it explodes. Will it cause radioactive problems, or will it not cause any problem?
    18 answers · 4 days ago
  • Could railgun rounds lose velocity in space?

    or would it continue at the same velocity when it was fired and continue on forever until it hits something?
    or would it continue at the same velocity when it was fired and continue on forever until it hits something?
    9 answers · 3 days ago
  • Is Isot possible to grain the human eye to see in slow motion? For if I want to be better in basketball or football I want to see in slow?

    Be able to maneuver past opponents in tricky situations. Can the human eye be trained to see in slow mo
    Be able to maneuver past opponents in tricky situations. Can the human eye be trained to see in slow mo
    5 answers · 9 hours ago
  • Can somebody please simply explain the many worlds theory? [READ DESCRIPTION]?

    I know that the many worlds theory says if you do one thing, there's another universe where you didn't do thing, or you did the thing but slightly differently, and so on and so forth an what have you. How does the many worlds theory explain how it works? (Genuine question, not trying to hate on science or... show more
    I know that the many worlds theory says if you do one thing, there's another universe where you didn't do thing, or you did the thing but slightly differently, and so on and so forth an what have you. How does the many worlds theory explain how it works? (Genuine question, not trying to hate on science or something stupid like that)
    5 answers · 10 hours ago
  • I am trying to understand forces and momentum, please help. The main thing is, if a e.g. bat knocks a ball, once the bat stops touching the?

    ball, what is it that keeps it moving through the air? I understand weights, like on scales, pivoting. Also how electrons can repel one another. But it's the point passed initial contact that confuses me. I've tried looking up momentum and velocity but it just outlined the way that they work, not really an... show more
    ball, what is it that keeps it moving through the air? I understand weights, like on scales, pivoting. Also how electrons can repel one another. But it's the point passed initial contact that confuses me. I've tried looking up momentum and velocity but it just outlined the way that they work, not really an answer to this. Is the explanation on a particle level? I want to know how, if you caught one ball that had been hit by a bat, and another that was simply dropped, on video, and paused it to show both balls near one another. While both balls are basically the same in appearance, mass, etc. - scientifically, what is it about the bat-ball bat means it will soar on, not drop straight down like the dropped-ball? Thank you for all answers
    8 answers · 3 days ago
  • Is a gravity field basically a force potential?

    Best answer: You need to use the terms used by Sir Albert Einstein and the meaning would sink in after a decade or so of studying physics. GRAVITY is a pucker (or dip) in the fabric of space time. 1821SJ10 First read this which you may not understand: Space time is created by force fields that tend to converge by gyrating... show more
    Best answer: You need to use the terms used by Sir Albert Einstein and the meaning would sink in after a decade or so of studying physics.
    GRAVITY is a pucker (or dip) in the fabric of space time.

    1821SJ10
    First read this which you may not understand: Space time is created by force fields that tend to converge by gyrating into a point mass. At the central point (center of gravity), the converging forces that spiral in form a dome (GRAVITON) that compresses the forces upward into the Y-column also called the pole or magnetic axis pole. Now after reading this which you may not understand, fit in a pucker in this model. Each time a dip forms, some volume is transferred away and this allows trans-location due to gravitation.
    6 answers · 2 days ago
  • Is it possible for a person to run at the speed of light?

    Best answer: Certainly not ......
    Best answer: Certainly not ......
    10 answers · 4 days ago
  • The speed of sound in a solid medium is 15 times greater than that in air.?

    The speed of sound in a solid medium is 15 times greater than that in air. If the frequency of a wave in the solid is 31 kHz, then what is the wavelength? (The speed of sound in air is 344 m/s.)
    The speed of sound in a solid medium is 15 times greater than that in air. If the frequency of a wave in the solid is 31 kHz, then what is the wavelength? (The speed of sound in air is 344 m/s.)
    4 answers · 9 hours ago
  • A block of aluminum at 204°C is put into 1.00 kg of water at 24.0°C. They came to equilibrium at 28.5°C.?

    What was the mass of the aluminum block Al c= 900 Water c= 4186 Unit = kg
    What was the mass of the aluminum block Al c= 900 Water c= 4186 Unit = kg
    4 answers · 18 hours ago
  • How can you stop temperature from effecting a resistor in a circuit (so the resistance is more constant and unaffected by temp).?

    ALSO IS THERE A WAY TO DECREASE THE RESISTANCE OF WIRES? LIKE SPECIAL WIRES YOU CAN USE?
    ALSO IS THERE A WAY TO DECREASE THE RESISTANCE OF WIRES? LIKE SPECIAL WIRES YOU CAN USE?
    8 answers · 4 days ago
  • Is there a "plank speed" or a maximum theoretical speed for a massive object?

    i was thinking that if we accept the concept of plank units, both time and space, then the maximum speed of an object would be to travel within 1 plank length per second of the speed of light. so for ever 2 plank lengths a photon travels the object travels 1 plank length. since plank units are fundamental units and... show more
    i was thinking that if we accept the concept of plank units, both time and space, then the maximum speed of an object would be to travel within 1 plank length per second of the speed of light. so for ever 2 plank lengths a photon travels the object travels 1 plank length. since plank units are fundamental units and cannot be subdivided then the object cannot possibly go faster becasue it could only travel 1 plank length faster per second, which is the speed of light. does this make sense?
    4 answers · 1 day ago
  • Kinematic eq?

    The kinematic equation x = v0t + (1/2)at2 suggests that the acceleration due to gravity can be determined by plotting a graph of position x as a function of time t. Such a graph would look a) linear with zero slope b) linear with a non-zero, constant slope c) parabolic d) No answer text provided.
    The kinematic equation x = v0t + (1/2)at2 suggests that the acceleration due to gravity can be determined by plotting a graph of position x as a function of time t. Such a graph would look a) linear with zero slope b) linear with a non-zero, constant slope c) parabolic d) No answer text provided.
    4 answers · 2 days ago
  • Physics anyone?

    I need to compare and contrast Analogue and Digital measurement devices. 10 POINTS
    I need to compare and contrast Analogue and Digital measurement devices. 10 POINTS
    5 answers · 2 days ago