angular momentum


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angular momentum

MRI
The cross product of the ordinary momentum of a particle and its position vector, running from the axis of rotation to the body whose momentum is being determined.

In absence of external forces, the angular momentum (AM) remains constant; therefore, a rotating body tends to maintain the same axis of rotation. When torque is applied to a rotating body, the resulting change in AM results in precession. Momentum involved in the rotation of a body about an axis is conserved, as is ordinary momentum. Atomic nuclei possess an intrinsic AM known as “spin”, which is measured in multiples of Planck’s constant.

an·gu·lar mo·men·tum

(ang'gyŭ-lăr mō-men'tŭm)
The spin of MR active nuclei, which depends on the balance between the number of protons and neutrons in the nucleus.
References in periodicals archive ?
We propose that the additional factor is the quantization of angular momentum per unit mass predicted by quantum celestial mechanics (QCM).
Their angular momentums were then compared to a simulated universe which contained 20,000 host galaxies similar to the Milky Way, with the whole simulation hosting about 90,000 satellite galaxies.
Sjoholm et al., "Utilization of photon orbital angular momentum in the low-frequency radio domain," Physical Review Letters, vol.
The effect of total angular momentum centrifugal term in (2) can be subdued using approximation scheme of the type [1-3, 14, 22, 27]
[4.] Ritsch-Marte, M., "Orbital angular momentum light in microscopy," Phil.
Rodenburg et al., "Influence of atmospheric turbulence on optical communications using orbital angular momentum for encoding," Optics Express, vol.
The values of [z.sub.min] and [[??].sub.m]([z.sub.min]) define the position of the plane of the classical horizontal circular track and the classical energy of the rotational state with the angular momentum m and the study of their evolution under external fields allows us to give below a simple interpretation of the spectral and magnetic and electric properties of the conical nanotube.
The angular momentum vector (H) of each segment (v) was calculated as the sum of local (HL) and transfer (HT) terms calculated using the methods of Dapena (1978).
The change of angular momentum of the motor vehicle relative to the longitudinal axis during a time dt can be represented as the difference of the angular momentums of mass during a time dt:
We measure this global error in position and velocity and the relative error in energy and angular momentum.
While the Einstein energy-momentum complex offers the important feature that conservation laws are well defined for both energy and momentum, it has the disadvantage of being asymmetric in its indices, making it difficult to define a conserved angular momentum. Moreover, the complex is highly dependent on the coordinate system used, favoring the use of quasi-Cartesian (small perturbations of a flat background) coordinates.
Chapters consider the basics physics involved in concepts of symmetry, balance, and angular momentum and discuss how they relate to animal cycles and behavior.