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AURORKA [14]
3 years ago
15

3 characteristics of chemical change

Physics
2 answers:
Doss [256]3 years ago
6 0

Answer: in chemical changes, usually new substances are formed. Signs of chemical changes are change of colour, temperature and formation of precipitation

gtnhenbr [62]3 years ago
3 0

Answer:

A physical change involves a change in physical properties. Examples of physical properties include melting, transition to a gas, change of strength, change of durability, changes to crystal form, textural change, shape, size, color, volume and density.

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First solve the potential energy of the biker. using the fomula:
PE = mgh
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For elevator questions, does the weight of a person increase when the elevator is going up or if it's going down-
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The weight of a person increase when the elevator is going up.

<h3>Weight of the person in the elevator</h3>

The weight of the person in the elevator is calculated as follows;

<h3>When the person is going up</h3>

F = ma + mg

F = m(a + g)

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<h3>When the person is going down</h3>

F = mg - ma

F = m(g - a)

Thus, the weight of a person increase when the elevator is going up.

Learn more about weight here: brainly.com/question/2337612

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