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Svet_ta [14]
4 years ago
15

3. What is the main difference between a physical change and a chemical

Physics
1 answer:
Lana71 [14]4 years ago
3 0

Answer:

B and D could both be right as they are quit similar.

Consider two rods of the same length and diameter,

Increasing the diameter of one would change the expansion qualities of that rod even though there would be no chemical changes,

However, leaving the physical appearance of both rods the same while applying a reactive substance (acid or something) to one of the rods would not necessarily change the physical appearance of that rod but could make a considerable change in the  physical properties of that rod.

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one of the ways, covered in the article and in class, that we charged an object was rubbing it against carpet on the floor true
astraxan [27]

Answer:

It is possible to statically charge objects by rubbing it against carpet fibers, but I'm not sure if that was in the article that you read.

Explanation:

Static charge can build up via carpet fibers.

5 0
3 years ago
Most grandfather clocks have pendulums with adjustable lengths. One such clock gains 10 min per day when the length of its pendu
7nadin3 [17]

The length to which the pendulum will be adjusted to keep perfect time is 29.59 inches. See the explanation below.

<h3>What is the justification for the above answer?</h3>

T1 = 2πR√(L1/GM)

and

T2 = 2πR√(L1/GM)

T1/T2 = √(L1/L2).

If the pendulum has an efficient period, that means it executes with perfect frequency.

Thus,

T2 = (24 * 60)/x

= 1440/x

This means that in one day, there are perfect cycles of represented by "x". Note that there are 1440 minutes in one day.

If the other Pendulum is slower by 10 minutes, that means

T1 = 1450/x

Hence

(1450/x)/(1440/x) = √(L1/L2).

⇒ 1450/1440 = √(L1/L2).

Thus,

(1450/1440)² = 30/L

L = 30/(1450/1440)²

L = 30/(1.00694444444)²

L = 30/1.01393711419

L = 29.5876337695

L $\approx$ 29.59 inches.

Hence, the pendulum will need to be adjusted by 29.59 inches to ensure that the clock keeps perfect time.

Learn more about pendulum problems:

brainly.com/question/16617199

#SPJ4

3 0
2 years ago
You are interested in space travel and want to learn more facts about space travel. Which would be the best source of informatio
Tpy6a [65]
A book or a professor
5 0
3 years ago
Read 2 more answers
There is a pulley arrangement with a worker standing on a raised platform. The worker is standing on a platform 4 m above the fl
vova2212 [387]

Answer:

I am kind of confused-

Explanation:

Do you mind re-writing and explaining the question more?

7 0
3 years ago
What are the principles of a micrometer screw guage
Usimov [2.4K]
Screw gauge or micrometer screw gauge is a measuring instrument used for precision measurement. A measuring device used extensively in the mechanical engineering field.

Hope this helps :)
4 0
3 years ago
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