• Light waves?

    Your Answer: 
    As we know I’d say a jet breaks the sound barrier, an observer would not hear the jet until it passed and the sound waves hit them because the waves of sound would be benhind the jet. Is this the same for light? If say a comet was moving towards you faster than the speed of light ( which isn’t possible, but just for curiosity reasons ) would you see... show more
    21 mins ago
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  • Are the laws of physics consistant/correct?

    Your Answer: 
    Hey, I was wondering for a while, what would happen if gravity suddenly stopped working, or if entropy stopped increasing, what would happen. I always imagined a chaotic disaster with people floating away and broken eggs reassembling. Anyways, I wanted to know, could the laws of physics stop working, and could everything go crazy, or more so, our... show more
    38 mins ago
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  • Physics hw help?

    Your Answer: 
    The plane is traveling at 267 m/s on a vertical circle of radius 642 m. Determine the ratio of the normal force to the magnitude of the pilot's weight.
    2 hours ago
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  • What is the wavelength of this xray in meters?

    Your Answer: 
    Radiation therapy utilizes high energy radiation such as x-rays and gamma rays. Normally, we try to limit our exposure to such high energy radiation as it can cause cell damage and death. However, our targeted use on tumors can also be used to kill cancer cells. Care must be taken to minimize the exposure of healthy tissues to this high radiation at... show more
    2 hours ago
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  • Physics help please?

    Your Answer: 
    the pitot tube is commonly used to measure the air speed of an aircraft. Air flows into a small opening at the end of a tube that is closed at the other end, bringing the air to rest and allowing the measurement of the pressure difference between air at rest inside the tube and air moving rapidly just outside the tube. If the high altitude air... show more
    4 hours ago
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  • Is it possible to cause a lightning strike where I want?

    Your Answer: 
    A person I really do not like, has bought themselves a poncy new car. I was thinking of a large spool of thin wire and a balloon and perhaps fastening it to his car's ariel when it's parked up in a thunderstorm. Would it work, and, is it an abuse of science?
    4 hours ago
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  • Escreva a PA em que a razao e a terça parte do primeiro termo e o nomo termo e igual a -11?

    Your Answer: 
    Escreva a PA em que a razao e a terça parte do primeiro termo e o nomo termo e igual a -11
    5 hours ago
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  • Copper wire of diameter 0.255 cm is used to connect a set of appliances at 120 V, which draw 2350 W of power total.?

    Your Answer: 
    What power is wasted in 29.0 m of this wire? i got 36.6 watt which is correct What is your answer if wire of diameter 0.485 cm is used? what the answer to this part?
    5 hours ago
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  • Physics question help!?

    Your Answer: 
    A skater and his skateboard have a combined mass of 50.0-kilograms. From a stationary start at the top, the skater descends a steep ramp. If the top of the ramp is 8.50-meters above the bottom, how fast is the skater traveling when he reaches the bottom of the ramp? Express your answer in meters per second. You may assume that friction effects... show more
    8 hours ago
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  • Physics question help?!?

    Your Answer: 
    A child having a mass of 35.0-kilograms is on a sled with a mass of 5.0-kilograms. If the child and sled traveling together have a kinetic energy of 260-joules from their motion, how fast are they moving? Express your answer in meters per second.
    8 hours ago
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  • Calculate the magnitude of the electric field at one corner of a square 1.33 m on a?

    Your Answer: 
    side if the other three corners are occupied by 6.57×10−6 C charges. I get E=kq/r^2 but am getting this prob constantly wrong
    9 hours ago
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  • If you had a container of air and pumped a bunch of helium into it, would the helium rise to the top like oil floating on water?

    Your Answer: 
    So say you have a metal box filled with air, then you pump in a lot of helium. Would he helium diffuse into the air evenly or rise to the top and float on top of the air like oil floating on water?
    10 hours ago
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