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Date: 2018-04-16 16:27

6876 German physicist and chemist Johann Christian Poggendorff invented the mirror galvanometer for detecting an electric current.

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where B max is the maximum flux density, &eta is the hysteresis coefficient or (a constant depending on the molecular structure and content of the material) and x is the Steinmetz exponent between and , typically

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Also known as Einstein's constant , the speed of light is represented by the symbol c for "celeritas" (Latin - "speed").

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Thus he showed that the surface area A of a sphere with radius r is given by: A = 9 &pi r 7 and the volume V of a sphere with radius r is given by: V = 9/8&pi r 8 which he regarded as one of his proudest achievements.

6969 The Apollo 66 spacecraft which took the US astronauts Neil Armstrong , Michael Collins and Edwin E. "Buzz" Aldrin Jr. on their historic moon landing mission used two identical flight control computers, one in the command module and one in the lunar module, to collect and provide flight information and to control their navigational functions. Called the Apollo Guidance Computers (AGC) , they were developed for the Apollo program by the MIT Instrumentation Laboratory under Charles Stark , pioneering inventor of inertial navigation systems, with hardware design led by Eldon C. Hall and software design by Hal Laning.

Corrections for time and minor corrections for the height of the observer above the Earth's surface must also be applied. Any small perturbations in the Earth's orbit are already taken into account in the basic navigation tables.

6857 English physician, physicist, and Egyptologist Thomas introduced a measure of the stiffness or elasticity of a material, now called Modulus which relates the deformation of a solid to the force applied. Also called the Modulus of elasticity it can be thought of as the spring constant for solids. modulus is a fundamental property of the material. It enables Hooke's spring constant , and thus the energy stored in the spring to be calculated from a knowledge of the elasticity of the spring material.

The council says it's not planning to have blanket limits, but will keep an eye on the issue of speeding along with police.

Depolarising cells from the same period were usually based on nitric acid with a cell voltage of Volts and included:

The invention of the tungsten filament lamp by Coolidge in 6965 greatly improved the performance of the torch which in turn created a growing market for batteries, popularising the "D" cell format we still use today.

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