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  2. Van Allen radiation belt - Wikipedia

    en.wikipedia.org/wiki/Van_Allen_radiation_belt

    The inner Van Allen Belt extends typically from an altitude of 0.2 to 2 Earth radii (L values of 1.2 to 3) or 1,000 km (620 mi) to 12,000 km (7,500 mi) above the Earth. [ 4 ] [ 16 ] In certain cases, when solar activity is stronger or in geographical areas such as the South Atlantic Anomaly , the inner boundary may decline to roughly 200 km ...

  3. Porter-Cable - Wikipedia

    en.wikipedia.org/wiki/Porter-Cable

    History. Porter-Cable was founded in 1906 in Syracuse, New York, by R.E. Porter, G.G. Porter, and F.E. Cable, who invested $2,300 in a jobbing machine and tool shop the trio ran out of a garage. In 1914, the company began to focus on power tools, starting with a line of lathes. Three years later, the company bought a plant on North Salina Street.

  4. Home Depot - Wikipedia

    en.wikipedia.org/wiki/Home_Depot

    The Home Depot, Inc. The Home Depot, Inc. is an American multinational home improvement retail corporation that sells tools, construction products, appliances, and services, including fuel and transportation rentals. Home Depot is the largest home improvement retailer in the United States. [4] In 2021, the company had 490,600 employees and more ...

  5. Harmonic series (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Harmonic_series_(mathematics)

    The top block can be placed with of its length extending beyond the next lower block. If it is placed in this way, the next block down needs to be placed with at most 1 21 2 {\displaystyle {\tfrac {1}{2}}\cdot {\tfrac {1}{2}}} of its length extending beyond the next lower block, so that the center of mass of the top two block is supported ...

  6. Belt sander - Wikipedia

    en.wikipedia.org/wiki/Belt_sander

    A belt sander or strip sander is a sander used in shaping and finishing wood and other materials. [ 1 ] It consists of an electric motor that turns a pair of drums on which a continuous loop of sandpaper is mounted. Belt sanders may be handheld and moved over the material, or stationary (fixed), where the material is moved to the sanding belt ...

  7. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    where f (2k−1) is the (2k − 1)th derivative of f and B 2k is the (2k)th Bernoulli number: B 2 = ⁠ 1 / 6 ⁠, B 4 = ⁠− + 1 / 30 ⁠, and so on. Setting f ( x ) = x , the first derivative of f is 1, and every other term vanishes, so [ 15 ]

  8. Power of two - Wikipedia

    en.wikipedia.org/wiki/Power_of_two

    Power of two. A power of two is a number of the form 2n where n is an integer, that is, the result of exponentiation with number two as the base and integer n as the exponent. Powers of two with non-negative exponents are integers: 20 = 1, 21 = 2, and 2n is two multiplied by itself n times. [1][2] The first ten powers of 2 for non-negative ...

  9. Quantum harmonic oscillator - Wikipedia

    en.wikipedia.org/wiki/Quantum_harmonic_oscillator

    As an example, consider the 3-dimensional case: Define n = n 1 + n 2 + n 3. All states with the same n will have the same energy. For a given n, we choose a particular n 1. Then n 2 + n 3 = n − n 1. There are n − n 1 + 1 possible pairs {n 2, n 3}. n 2 can take on the values 0 to n − n 1, and for each n 2 the value of n 3 is fixed.

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