Answer:
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Answer:
An element is a pure substance and is made of only one type of atom; it cannot be broken down into a simpler substance. Overview: In this activity, students practice using the periodic table to look up chemical symbols of elements and use paper circles to construct and compare models of elements and compounds.
Explanation:
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Answer:
the magnitude of gravitational force would be 20 N
Explanation:
therefore on a body of mass m by earth is
where M is the mass of earth m is the mass of body, G is the gravitational constant and r is the distance of seperation from centre of earth.
therefore F =
therefore F = 20 N.