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Force between magnets. Magnets exert forces and torques on each other through the interaction of their magnetic fields. The forces of attraction and repulsion are a result of these interactions. The magnetic field of each magnet is due to microscopic currents of electrically charged electrons orbiting nuclei and the intrinsic magnetism of ...
In mechanics, a cylinder stress is a stress distribution with rotational symmetry; that is, which remains unchanged if the stressed object is rotated about some fixed axis. Cylinder stress patterns include: circumferential stress, or hoop stress, a normal stress in the tangential ( azimuth) direction. axial stress, a normal stress parallel to ...
Drag equation. In fluid dynamics, the drag equation is a formula used to calculate the force of drag experienced by an object due to movement through a fully enclosing fluid. The equation is: where. F d {\displaystyle F_ {\rm {d}}} is the drag force, which is by definition the force component in the direction of the flow velocity,
The drag coefficient is defined as. where: F d {\displaystyle F_ {\mathrm {d} }} is the drag force, which is by definition the force component in the direction of the flow velocity; [ 9 ] ρ {\displaystyle \rho } is the mass density of the fluid; [ 10 ] u {\displaystyle u} is the flow speed of the object relative to the fluid;
List of moments of inertia. Moment of inertia, denoted by I, measures the extent to which an object resists rotational acceleration about a particular axis, it is the rotational analogue to mass (which determines an object's resistance to linear acceleration ). The moments of inertia of a mass have units of dimension ML 2 ( [mass] × [length] 2 ).
The capstan equation[ 1] or belt friction equation, also known as Euler-Eytelwein formula[ 2] (after Leonhard Euler and Johann Albert Eytelwein ), [ 3] relates the hold-force to the load-force if a flexible line is wound around a cylinder (a bollard, a winch or a capstan ). [ 4][ 1] It also applies for fractions of one turn as occur with rope ...
In continuum mechanics, stress is a physical quantity that describes forces present during deformation. For example, an object being pulled apart, such as a stretched elastic band, is subject to tensile stress and may undergo elongation. An object being pushed together, such as a crumpled sponge, is subject to compressive stress and may undergo ...
Fuller calculator, Fuller-Bakewell model of 1928. The Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long.