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Explanation:

a balanced force is balanced perfectly and vise versa

When two forces are the same strength but act in opposite direction, they are called balanced forces. Again, tug-of-war is a perfect example. When two forces acting on an object are not equal in size, we say that they are unbalanced forces.  You can think of it like this: if you push a book lying on a table really hard (an easy example of unbalanced force), it will begin to move. This means that it accelerates from lying still to moving.

Explanation:

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answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

spectral lines lyman is one set