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LUCKY_DIMON [66]

4 years ago

10

Which is an example of a chemical change?

2 answers:

KonstantinChe [14]4 years ago

4 0

Which is an example of a chemical change?

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity. Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding.

MatroZZZ [7]4 years ago

4 0

Answer: Option C

Explanation: The chemical change can be defined as the change that once occurred cannot be reversed by any means.

The metal corrosion in the salt water is an example of chemical change as it cannot be reversed once the metal is corroded. This also results in the change in the color of the metal and further decaying of the metal at later stages.

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Darya [45]

C. It was mainly concerned about wildlife.

Birds and other wild animals can be scared away from the area. This would affect the ecosystem and the local webchains.

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3 years ago

Define cyber law and its types.

butalik [34]

Answer:

Cyber Law is a generic term referring to all the legal and regulatory aspects of the internet. Everything concerned with or related to or emanating from any legal aspects or concerning any activities of the citizens in the cyberspace comes within the ambit of cyber laws.

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Copyright
Patents
Trademarks or Service Marks
Trade Secrets
Domain Disputes
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Explanation:

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5 0

2 years ago

The automobile has a weight of 2700 lb and is traveling forward at 4 ft>s when it crashes into the wall. If the impact occurs

alex41 [277]

Answer:

$F_b=153918\, lb.ft.s^{-2}$

Explanation:

Given:

mass, $m=2700 \,lb$

time, $t=0.06\,s$

velocity, $v=4\,ft.s^{-1}$

coefficient of kinetic friction between wheels & pavement, $\mu=0.3$

According to first condition,

$F\times \Delta t=m\times v$

$F\times 0.06= 2700\times 4$

$F=180000\,lb.ft.s^{-2}$

According to second condition,

<u>Magnitude of frictional force (which acts opposite to the direction of motion):</u>

$f=\mu.N$

where N is the normal reaction.

$f=0.3\times 2700\times 32.2$

$f=26082 \,lb.ft.s^{-2}$

Now, the impulsive force on the wall if the brakes were applied during the crash:

$F_b= F-f$

$F_b=180000-26082$

$F_b=153918\, lb.ft.s^{-2}$

3 0

3 years ago

What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?

Korvikt [17]

Answer:

2%

Explanation:

75% of the mass contains hydrogen 25% helium and all other elements comprising only of 2%

6 0

3 years ago

Read 2 more answers

1.14 Which of the following is an example of a force without touching? A A boy pushing a trolley. B The mass of a car. C с A mag

andriy [413]

Explanation:

Option C a magnet attracting a nail

4 0

3 years ago