Nevertheless, on the other hand, for historical reasons, an oft-encountered sign convention is to consider work done by the system on its surroundings as positive.
42.
In the sign convention used here, the object and image distances are positive if the object and image are on opposite sides of the lens.
43.
Other sign conventions can be obtained by changing any a _ k to-a _ k, and / or any b _ k to-b _ k.
44.
Circular dichroism ( CD ) is then defined as ?k = k k +, and it follows the sign convention of natural optical activity.
45.
This " equal sign convention " is only used here in this Wikipedia article to represent the actual Morse prosign often verbalized as " dahdidididah ".
46.
:: : I just noticed that the article says that nuclear binding energy is always positive, but that's just because they're using the opposite sign convention.
47.
The minus sign arises from the traditional definition of the cross product ( right hand rule ), and from the sign convention for angular velocity vectors.
48.
The sign convention here dictates that if " M " is negative, as it is for real images, the image is upside-down with respect to the object.
49.
(Some authors use the opposite sign convention for, so that is positive when the incoming and reflected magnetic fields are anti-parallel, and negative when they are parallel.
50.
The descriptions below use vector mechanics to compute moments of force and bending moments in an attempt to explain, from first principles, why particular sign conventions are chosen.
