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ss7ja [257]
4 years ago
10

Is hot asphalt that is poured into the ground and cools a physical or chemical change?

Physics
2 answers:
Gala2k [10]4 years ago
5 0
Physical change
Because it's changed by heat
BaLLatris [955]4 years ago
5 0
Physical. the asphalt itself is not changing. Only its state, from liquid to solid.
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Explanation:

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An old streetcar rounds a flat corner of radius 6.80 m, at 18.0 km/h. What angle with the vertical will be made by the loosely h
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Answer:

\alpha =20.564^{o}

Explanation:

Given data

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Substitute expression for Fc and T into horizontal force and simplify it we get

Fc=TSin\alpha\\ where\\Fc=(mv^{2}/R )\\So\\(mv^{2}/R )=(mg/Cos\alpha )Sin\alpha\\(mv^{2}/R )=mg*tan\alpha\\  tan\alpha =\frac{v^{2} }{Rg}\\ \alpha =tan^{-1}(\frac{(5m/s)^{2} }{(6.80m)(9,8m/s^{2} )} )\\ \alpha =20.564^{o}

 

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