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1. ### How can I make a simple tachometer to measure rotation speed by using reed switch?

...brief positive going pulse produced at the output of the monostable for each rotation. The output pulses will then be a series of very short pulses...

3 Answers · Science & Mathematics · 25/05/2009

2. ### What is the direction of magnetic rotation in a shaded pole induction motor? (single phase)?

... located ahead of the main winding in the direction of rotation. (The direction of rotation is from the unshaded side to the shaded...

2 Answers · Science & Mathematics · 09/04/2010

3. ### Find center of rotation and you win a million dollars!?

v=ω.r ; so: r=v/ω = 5/35 = ⅟7 ft from and to the right of A where r is the distance from A to the rotation centre. Speed at B = 5 × 4⅟7 /⅟7 = 5 × 34 = 170 fps

2 Answers · Science & Mathematics · 02/04/2013

4. ### why are pumps direction of rotation not designed to conform with the default direction of rotation of motors?

It's anyway very easy to change the rotation direction of most motors by swapping over two of the three connecting...

3 Answers · Science & Mathematics · 15/11/2013

5. ### Express the period of rotation in terms of the radius and the coefficient of friction, μs.?

...stone: N =m.4π^2.R/T^2 where T is the period of rotation. Substituting, μs.m4π^2.R/T^2 ≥ mg Simplifying...

1 Answers · Science & Mathematics · 16/06/2012

6. ### help finding instantaneous center of rotation (picture of bar included)?

v=ω.r ; so: r=v/ω = 5/35 = ⅟7 ft from and to the right of A where r is the distance from A to the rotation centre. Speed at B = 5 × 4⅟7 /⅟7 = 5 × 34 = 170 fps

1 Answers · Science & Mathematics · 02/04/2013

7. ### Is the data transfer rate of the disc the same as the speed of rotation of the disc?

...transfer rate is "how fast information gets on the disk". Rotation is "how fast the disk spins". For example...

3 Answers · Science & Mathematics · 06/12/2006

8. ### I am running an experiment with rotation and I could use some advice?

...may want to remove any batteries from the device to make the point that when rotation stops the device loses power.

3 Answers · Science & Mathematics · 13/08/2010

9. ### Was there a man who knew how to create energy from earth's rotation?

Anyone with a wind mill knows how to extract energy from the Earth's rotation (with some energy from sunlight added of course).

1 Answers · Science & Mathematics · 05/07/2012

10. ### Express the period of rotation in terms of the radius and the coefficient of friction, μs...?

...stone: N =m4π^2R/T^2 where T is the period of rotation. Substituting ; μ(s)m4π^2R/T^2 ≥ mg Simplifying...

1 Answers · Science & Mathematics · 14/07/2012