And the rotation has to be both continuous and at a constant speed, which for the LZT is 8.5 revolutions per minute.
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The energy travels in a straight line at a constant speed.
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That has a lot of implications about gravity, the constant speed of light, and various other issues including mass and what we could say about it.
Because it is far more efficient to unwind the spring at a constant speed, rather than stopping and starting it, this provides enough energy to run the radio for an hour.
Audi claims the A8 Hybrid will be able to run at speeds up to 62 mph solely on electric power, and will produce zero local emissions at a constant speed of 37 mph.
Keeping rates where they are amounts to driving at a constant high speed even when the road ahead bends sharply.
Substantially more complex than previous aircraft, the new plane required the pilot to attend to the four engines, a retractable landing gear, new wing flaps, electric trim tabs that needed adjustment to maintain control at different airspeeds, and constant-speed propellers whose pitch had to be regulated with hydraulic controls, among other features.
And in the science of optics, the fact that the speed of light is constant in a vacuum is taken for granted.
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Making his first Premier League start, Oxlade-Chamberlain was a constant menace to United with his speed and trickery and he set up the home team's equalizing goal in the 71st minute, when his neat reverse pass was swept home by Robin Van Persie, the club's leading scorer.
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He has written a book suggesting that the speed of light is not constant, but was faster near the moment of the big bang with which most cosmologists believe the universe started.
But the speed of light must not be constant if the universe is only 9, 000 years old.
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The vehicle can then adjust its speed so that it maintains a constant and respectful distance from the car in front.
He is following a simple rule: Keep the angle of the falling ball constant in your vision and adjust your running speed accordingly.
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The software in the four-seater Piper Warrior light plane will allow Mr Cunningham to receive constant updates on the plane's height, position and speed at the touch of a button.
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When speed of execution is normative and rapid-fire decisions are a constant, the art of reflection can seem quaint, a holdover perhaps from earlier, more sedate times.
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