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Molecules are made up of atoms that are held together by chemical bonds. These bonds form as a result of the sharing or exchange of electrons among atoms. The atoms of certain elements readily bond with other atoms to form molecules. ... The element helium is a one-atom molecule.
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So the answer to the question "who invented table tennis?" is ... Englishman David Foster. An English Patent (number 11,037) was filed on 15 July 1890 when David Foster of England introduced the first action game of tennis on a table in 1890. Only one example is known to have survived and it's now on display in the ITTF Museum.
Explanation:
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Explanation:As a calendrical period, the month is derived from the lunation—i.e., the time elapsing between successive new moons (or other phases of the moon). A total of 12 lunations amounts to 354 days and is, roughly, a year. A period of 12 lunations was therefore used by some primitive peoples to make their calendrical year.
(a) The net force upward force of the helicopter is -35,880 N.
(b) The weight of the helicopter is 45,080 N.
(c) The lift-force exerted by the air on the propellers is 9,200 N.
The given parameters:
- <em>mass of the helicopter, m = 4600 kg</em>
- <em>acceleration of the helicopter, a = 2 m/s²</em>
The net force upward force of the helicopter is calculated as follows;
The weight of the helicopter is calculated as follows;
The lift-force exerted by the air on the propellers is calculated as follows;
Learn more about Newton's 2nd Law here: brainly.com/question/3999427
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the metamorphic rock converts into other rock types under different conditions