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Many historians view the second-wave feminist era in America as ending in the early 1980s with the intra-feminism disputes of the feminist sex wars over issues such as sexuality and pornography, which ushered in the era of third-wave feminism in the early 1990s.
Second-wave feminism was a period of feminist activity that began in the early 1960s and lasted roughly two decades, ending with the feminist sex wars in the early 1980s [1] and being replaced by third-wave feminism in the early 1990s. [2]
The two-dimensional analogue of the vibrating string is the vibrating membrane, with the edges clamped to be motionless. The Helmholtz equation was solved for many basic shapes in the 19th century: the rectangular membrane by Siméon Denis Poisson in 1829, the equilateral triangle by Gabriel Lamé in 1852, and the circular membrane by Alfred Clebsch in 1862.
The wave equation is a second-order linear partial differential equation for the description of waves or standing wave fields such as mechanical waves (e.g. water waves, sound waves and seismic waves) or electromagnetic waves (including light waves). It arises in fields like acoustics, electromagnetism, and fluid dynamics.
[citation needed] More precisely, the Cauchy problem can be locally solved for arbitrary initial data along any non-characteristic hypersurface. Many of the equations of mechanics are hyperbolic, and so the study of hyperbolic equations is of substantial contemporary interest. The model hyperbolic equation is the wave equation.
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2 O, are not co-linear (a co-linear triatomic gas such as CO 2 is equivalent to a diatomic gas for our purposes here); T is the absolute temperature; M is the molar mass of the gas. The mean molar mass for dry air is about 0.02897 kg/mol (28.97 g/mol); n is the number of moles; m is the mass of a single molecule.
This linear growth is a reflection of the (time-invariant) momentum uncertainty: the wave packet is confined to a narrow Δx = √ a/2, and so has a momentum which is uncertain (according to the uncertainty principle) by the amount ħ/ √ 2a, a spread in velocity of ħ/m √ 2a, and thus in the future position by ħt /m √ 2a. The uncertainty ...