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belka [17]
3 years ago
9

(a) From an atomic point of view, why do you have to heat a solid to melt it? (b) If you have a solid and a liquid at room tempe

rature, what conclusion can you draw about the relative strengths of their inter-atomic forces?
Physics
1 answer:
kow [346]3 years ago
6 0

Answer:

A. & B. Heat energy is needed to convert solid into a liquid because heat energy increases the kinetic energy of the particles. The heat energy that it used to change 1 kg of solid into liquid at atmospheric pressure and at its melting point is called the latent heat of fusion.

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3 0
3 years ago
A person drives 20 miles north and 45 miles east. What is the angle of the resultant straight to their destination?
Alex787 [66]
Let us take east and north as the positive x and y-axes should the motion be plotted in a cartesian plane. Thus, the x value is 45 miles and the y value is 20. The tangent of an angle is equal to the ratio of y to x.

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Substituting,

   tanθ = 20/45 = 0.44

The value of θ is 23.96°.
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Volgvan

Answer:

option D is the correct option

Must always remain constant

Explanation:

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Agree or disagree
OLga [1]
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4 0
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