تعريف angular momentum في الإنجليزية الإنجليزية القاموس.
The vector product that describes the rotary inertia of a system about an axis and is conserved in a closed system. For an isolated rigid body, it is a measure of the extent to which an object will continue to rotate in the absence of an applied torque
a measure of the amount of spin or orbital motion an object has It is proportional to the mass of the object multiplied by its radius multiplied by its spin or orbital speed
Rotating momentum, as shown, for example, in Earth's daily rotation around its axis
rotational analogue of momentum, in units of mass*length2/time (see rotational kinematics)
Any object spinning or orbiting about a point carries angular momentum This is basically related to the size and mass of the object As spinning objects contract, they must spin faster to conserve angular momentum, or else fragment in order to share the momentum among the different parts This is significant in astronomy in causing stars forming out of slowly rotating clouds to form as pairs or multiples or to form planets as the Sun did In the Solar system, while the Sun contains 1000 times as much mass as all the planets combined, the planets account for 99 7% of the angular momentum It is believed that the rapid spin rates of neutron stars are a result of the need to conserve angular momentum
A quantity obtained by multiplying the mass of an orbiting body by its velocity and the radius of its orbit According to the conservation laws of physics, the angular momentum of any orbiting body must remain constant at all points in the orbit Thus planets in elliptical orbits travel faster when they are closest to the Sun, and more slowly when farthest from the Sun A spinning body also possesses spin angular momentum
or moment of momentum the product of the tangential momentum of a body and its radial distance from the axis of rotation
For a particle in a spherical orbit, the product of the mass of the particle times its velocity times the radius of the orbit
a vector quantity given by the vector product of the momentum of a particle and its position vector In the absence of external forces, the angular momentum remains constant, with the result that any rotating body tends to maintain the same axis of rotation When a torque is applied to a rotating body, the resulting change in angular momentum results in precession Atomic nuclei posses an intrinsic angular momentum referred to as spin, measured in multiples of Plancks constant
the product of the momentum of a rotating body and its distance from the axis of rotation; "any rotating body has an angular momentum about its center of mass"; "angular momentum makes the world go round
The momentum of a body associated with its rotation or revolution For a body in a circular orbit, angular momentum is the product of orbital distance, orbital speed, and mass When two bodies collide or interact, angular momentum is conserved
A measure of an object's rotation about a particular axis; more specifically, the product of its rotational inertia and rotational velocity For an object that is small compared to the radial distance, it is the product of mass speed, and radial distance of rotation Angular Momentum = rotational inertia x rotational velocity (mvr)
Property that describes the rotary inertia of a system in motion about an axis. It is a vector quantity, having both magnitude and direction. The magnitude of the angular momentum of an object is the product of its linear momentum (mass m velocity v) and the perpendicular distance r from the centre of rotation, or mvr. The direction is that of the axis of rotation. The angular momentum of an isolated system is constant. This means that a rigid spinning object continues to spin at a constant rate unless acted upon by an external torque. A spinning gyroscope in an airplane remains fixed in its orientation, independent of the airplane's motion, because of the conservation of direction as well as magnitude
A vector quantity defined relative to a rotation axis and defined as the product of an object's moment of inertia and its angular velocity
Measure of the quantity of rotation possessed by a spinning body about an axis or external point
The product of mass times the perpendicular distance from the axis of rotation times the rotation velocity The angular momentum about the Earth's axis of rotation can be expressed as the sum of the angular momentum of the solid Earth's rotation plus the angular momentum of zonal air motion relative to the surface of the Earth Were this quantity to be absolutely conserved, a parcel of air with the angular momentum of the Earth's surface at the Equator would have a westerly zonal wind speed of 134 m/s at 30° latitude See Hartmann (1994)
A vector quantity with magnitude equal to the mass moment of inertia times the angular velocity; describes the ability of a rotating or orbiting object to resist forces that would tend to change the rotation rate (16 0K)
A measure of the tendency of a rotating body to continue rotating Mathematically, the product of mass, velocity, and radius