How fast do helicopter blades spin?

Answer Helicopters in general have a blade speed of 300 knots (about 300 mph) when hovering and when moving forward they have a blade speed of about 400 knots (460 mph). If a helicopter has two blades, th... Read More »

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How fast does a blue ray DVD spin?

They are made by the Chinese company TCL, and branded Logik to be sold by the Dixons (formerly DSG) group of outlets. The Logik LBD-1000 is known by its manufacturer TCL as the THBD-1000.

How fast does the earth spin per second?

At the equator, the earth spins at a speed of 1,070 miles per hour, or 460 miles per second. At higher latitudes, the spin rate becomes slower, because the earth is a globe.Source:StarrySkys: How F... Read More »

How fast does a floppy drive spin?

Most floppy disk drives spin at a rate of 300 RPM, revolutions per minute. The one exception is the 5.25-inch 1.2 Megabyte drive which spins at a rate of 360 RPM.References:The PC Guide: Summary of... Read More »

How fast does an alternator have to spin to recharge a battery?

An alternator will recharge a battery at any speed if it produces the same voltage as the battery. The speed at which an alternator spins will control the current, which controls the time it takes ... Read More »