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  2. Europa Clipper - Wikipedia

    en.wikipedia.org/wiki/Europa_Clipper

    The high-gain antenna operates on X-band frequencies of 7.2 and 8.4 gigahertz, and a Ka-band frequency of 32 gigahertz (12 times that of a typical cell phone).The antennas will be used to research gravity and radio science, allowing researchers to learn more about Europa's gravity [88] It was designed and constructed by a team led by Matt Bray ...

  3. Gravity battery - Wikipedia

    en.wikipedia.org/wiki/Gravity_battery

    Pendulum clock driven by three weights as "gravity battery". An old and simple application is the pendulum clock driven by a weight, which at 1 kg and 1 m travel can store nearly 10 Newton-meter [Nm], Joule [J] or Watt-second [Ws], thus 1/3600 of a Watt-hour [Wh], while a typical Lithium-ion battery 18650 cell [2] can hold about 7 Wh, thus 2500 times more at 1/20 of the weight.

  4. Ratchet (device) - Wikipedia

    en.wikipedia.org/wiki/Ratchet_(device)

    A ratchet (occasionally spelled rachet) is a mechanical device that allows continuous linear or rotary motion in only one direction while preventing motion in the opposite direction. Ratchets are widely used in machinery and tools. The word ratchet is also used informally to refer to a ratcheting socket wrench.

  5. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    4.5 + 4.5: H: 91.3 L: 65.1 W: 52.4 This battery contained two independent 4.5 V batteries, and had a four-pin connector. 9 V with a center tap was available by wiring in series. There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart.

  6. Europa (moon) - Wikipedia

    en.wikipedia.org/wiki/Europa_(moon)

    Europa's gravity is approximately 13% of Earth's. The temperature on Europa varies from −160 °C at the equator, to −220 °C at either of its poles. [145] Europa's subsurface ocean is thought to be significantly [clarification needed] warmer however. It is hypothesized that because of radioactive and tidal heating (as mentioned in the ...

  7. Talk:Gravity battery - Wikipedia

    en.wikipedia.org/wiki/Talk:Gravity_battery

    If we assume a change in height of 10 meters (roughly 30 feet) using a 10 meter long hydraulic cylinder, and we assume a 10 metric tonne mass (10,000 kg, roughly 20,000-25,000 pounds), then the energy being stored is equal to the change in gravitational potential energy, which is (mass) * (∆height) * (g) = (10,000 kg) * (10 m) * (10 (m/s 2 ...

  8. Moral Injury: The Grunts - The Huffington Post

    projects.huffingtonpost.com/moral-injury/the...

    Can we imagine ourselves back on that awful day in the summer of 2010, in the hot firefight that went on for nine hours? Men frenzied with exhaustion and reckless exuberance, eyes and throats burning from dust and smoke, in a battle that erupted after Taliban insurgents castrated a young boy in the village, knowing his family would summon nearby Marines for help and the Marines would come ...

  9. Lunar Roving Vehicle - Wikipedia

    en.wikipedia.org/wiki/Lunar_Roving_Vehicle

    The selection of wheels was of great importance, and almost nothing was known at that time about the lunar surface. The Marshall Space Sciences Laboratory (SSL) was responsible for predicting surface properties, and Brown was also prime support contractor for this lab; Brown set up a test area to examine a wide variety of wheel-surface conditions.

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