3 years ago

Based on its location on the periodic table, which element is a metal?

Physics

2 answers:

soldier1979 [14.2K]3 years ago

8 0

A. Sodium, it is the only type of metal listed I believe!

goldfiish [28.3K]3 years ago

6 0

Sodium (Na) is a Alkali metal so that's the answer

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Answer:

$(a)0.5m(2v1v2+v2^{2})\\(b)0.5m(v2^{2}-v1^{2})\\(c)0.5m(2v1v2+v2^{2})\\(d)0.5m(v2^{2}-v1^{2})$

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Change in kinetic energy is given by subtracting initial kinetic energy from the final kinetic energy. In this case

Initial kinetic energy= $0.5mv1^{2}$

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Change in kinetic energy= $0.5m (v1+v2)^{2}-0.5mv1^{2}=0.5m((v1+v2)^{2})-v1^{2}=0.5m(2v1v2+v2^{2}$

(b)

Change in velocity in train reference will be

Initial kinetic energy= $0.5mv1^{2}$

Final kinetic energy= $0.5mv2^{2}$

Change in kinetic energy= $0.5m(v2^{2}-v1^{2})$

(c)

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(d)

Work done, W = change in kinetic energy= $0.5m(v2^{2}-v1^{2})$

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3 years ago

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