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Pennsylvania ( / ˌpɛnsɪlˈveɪniə / ⓘ, lit. 'Penn's forest country' ), officially the Commonwealth of Pennsylvania [b] ( Pennsylvania Dutch: Pennsylvanie ), [7] is a state spanning the Mid-Atlantic, Northeastern, Appalachian, and Great Lakes regions of the United States.
Hydrogen peroxide ( H2O2) is a nonplanar molecule with (twisted) C 2 symmetry; this was first shown by Paul-Antoine Giguère in 1950 using infrared spectroscopy. [9] [10] Although the O−O bond is a single bond, the molecule has a relatively high rotational barrier of 386 cm −1 (4.62 kJ / mol) for rotation between enantiomers via the trans ...
In 2018, 52% of Americans age 15 and over were married, 6% were widowed, 10% were divorced, and 32% had never been married. In 2021, the total fertility rate for the U.S. stood at 1.7 children per woman, [345] and it had the world's highest rate of children (23%) living in single-parent households in 2019. [346]
As of 2017, 13.6% (44.4 million) of the population was foreign born – an increase from 4.7% in 1970 but less than the 1890 record of 14.8%. 45% of the foreign born population were naturalized US citizens. 23% (10.3 million) of the foreign born community is undocumented, accounting for 3.2% of the total population.
The Great Depression (1929–1939) was a severe global economic downturn that affected many countries across the world. It became evident after a sharp decline in stock prices in the United States, leading to a period of economic depression. [1] The economic contagion began around September 1929 and led to the Wall Street stock market crash of ...
Similarly, a time dilation factor of γ = 10 occurs at 99.5% the speed of light (v = 0.995 c). The results of special relativity can be summarized by treating space and time as a unified structure known as spacetime (with c relating the units of space and time), and requiring that physical theories satisfy a special symmetry called Lorentz ...