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Miley Cyrus spreads her wings as she debuts raunchy new image in video for new single
Teen queen Miley Cyrus is ready to move on from Hannah Montana. The 17-year-old has ditched her wholesome image for something a lot more raunchy and edgy in the video for her new single Can't Be Tamed. The clip for the Britney-esque song shows a more grown-up Miley in dramatic makeup and sexy costumes, dancing provocatively with her backing dancers
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What would happen if you went mach 5 underwater?
Question:
In some sort of vehicle, no enclosure around the vehicle, just literally zooming through the ocean at like mach 4-5.
Would there be some sort of underwater sonic-boom?
Would this take a lot more fuel than say a blackbird jet zooming through the air?
Does the military have vehicles that travel anywhere near this speed?
Even black-budget secret vehicles?
Answer:
An object is traveling through a medium at velocity V. The speed of sound for the medium is S. The mach number is the ratio of an object's velocity to the speed of sound and is expressed as V/S. The speed of sound varies for each medium and is related to its density. V for air is 340 m/s, water is 1500 m/s. Water is denser than air.
In an airplane, achieving Mach 1 (340 m/s) and higher is possible since moving an object through air is easy. Motion through a medium displaces (moves) the medium. It's easy to displace low density air. It is much harder to displace water. To achieve Mach 1 in water (1500 m/s) would take enormous energy and is not practical. Compare Olympic track runners to swimmers. The runners always go faster since they are competing in a lower density medium.
So in sum, you need to go faster in water to achieve Mach 1 than in air. The energy needed to reach Mach 1 is astronomical. Getting to Mach 4 is orders of magnitude more difficult.
The major reason for military vehicles moving in the ocean is stealth. A vehicle moving at Mach 4 under the ocean is anything but stealthy.
