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1. ### How many windmills can we build without stopping the earth's rotation?

...another area, north in another area, etc. etc., so the effects on the earth's rotation are random, therefore there is little effect. Windmills, everywhere...

5 Answers · Science & Mathematics · 17/07/2007

2. ### Why are most screws tightened with a clockwise rotation?

convention, standardisation. Right hand screw threads are used as standard except where anticipated movement or rotation dictates otherwise.

9 Answers · Science & Mathematics · 02/12/2007

3. ### 360 rotation Servo question?

So long as it isn't listed as a continuous rotation servo, yes... it is a fully positional servo with 0 360 degree limits. (0 and 360 are coincident)

3 Answers · Science & Mathematics · 09/12/2012

4. ### How can I count the number of rotations my DC (direct current) motor makes? What tool can I use to count...?

...measure voltage across the motor. This 'back emf' is proportional to rotational velocity. Send different voltages to the motor and find the proportionality...

5 Answers · Science & Mathematics · 09/12/2006

5. ### A hovercraft starts from rest and undergoes a pure rotation with a constant angular acceleration. If it takes?

Basic rotational kinematic equation for constant alpha: theta-theta0=omega0*t+1/2*alpha*t^2 Substitute...sec. Now using the same equation, plug in scenario two. Total rotation is 78 degrees, omega0=0, alpha is 85.511 deg/sec/sec. ...

1 Answers · Science & Mathematics · 08/03/2014

6. ### what is weld axis and angle of rotation?

...of the weld, such as the moment of inertia, center of gravity, etc. The angle of rotation would normally be the angle between the axis, as above, and the direction of the load ...

1 Answers · Science & Mathematics · 11/01/2008

7. ### The induced current in an electric generator is alternating. After half a rotation does it alternate? 10p?

...sine wave. It rises in the positive direction from 0 to a maximum at 1/4 rotation, goes back through 0 at 1/2 rotation and then goes negative to a maximum...

2 Answers · Science & Mathematics · 30/04/2009

8. ### How can I limit the amount of rotation in a box section?

Open sections always present high rotation, compared with closed sections. What can be ...

1 Answers · Science & Mathematics · 05/11/2013

9. ### Correct axis choice for Rotation in Steam Engine?

If you are only concerned with the rod, then you must take the rotation as being about the C.of G. of the rod.

1 Answers · Science & Mathematics · 29/04/2011

10. ### What is the direction of rotation when a synchonous generator works as motor?

...that will be generated but there will be no increase in speed as the speed of rotation is governed by the frequency of the grid. When the prime mover...

2 Answers · Science & Mathematics · 13/11/2008