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enot [183]
3 years ago
15

When iron rusts, iron atoms are destroyed true or false?

Physics
1 answer:
vfiekz [6]3 years ago
3 0
False. this is just a physical change, not a chemical change. 
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An empty graduated cylinder weighs 55.26 g. When filled with 48.1 mL of an unknown liquid, it weighs 92.39 g. The density of the
katrin [286]
<h2>Density of the unknown liquid is 771.93 kg/m³</h2>

Explanation:

An empty graduated cylinder weighs 55.26 g

Weight of empty cylinder = 55.26 g = 0.05526 kg

Volume of liquid filled = 48.1 mL = 48.1 x 10⁻⁶ m³

Weight of cylinder plus liquid = 92.39 g = 0.09239 kg

Weight of liquid = 0.09239 - 0.05526

Weight of liquid = 0.03713 kg

We have

        Mass = Volume x Density

        0.03713 = 48.1 x 10⁻⁶ x Density

        Density = 771.93 kg/m³

Density of the unknown liquid is 771.93 kg/m³

5 0
3 years ago
A boy weighing 150 N goes (a) up and (b) down a flight of stairs. The vertical distance between the floor is 5.5 m. How much wor
crimeas [40]
The answer would be A
3 0
3 years ago
How can the IMA of a first- class lever be increased?
Dimas [21]
IMA = Ideal Mechanical Advantage

First class lever = > F1 * x2 = F2 * x1

Where F1 is the force applied to beat F2. The distance from F1 and the pivot is x1 and the distance from F2 and the pivot is x2

=> F1/F2 = x1 /x2

IMA = F1/F2 = x1/x2

Now you can see the effects of changing F1, F2, x1 and x2.

If you decrease the lengt X1 between the applied effort (F1) and the pivot,  IMA decreases.

If you increase the length X1 between the applied effort (F1) and the pivot, IMA increases.

If you decrease the applied effort (F1) and increase the distance between it and the pivot (X1) the new IMA may incrase or decrase depending on the ratio of the changes.

If you decrease the applied effort (F1) and decrease the distance between it and the pivot  (X1) IMA will decrease.

Answer: Increase the length between the applied effort and the pivot.
4 0
4 years ago
Read 2 more answers
How many elemens are listed in the periodic table
Vesnalui [34]
118 elements
from what knowledge i have gathered in my human brain i hope that this is helpful
5 0
4 years ago
Read 2 more answers
Which of the following is an example of a long-term climatic change?
Vaselesa [24]
Winter and Summer happen every year, pretty much on schedule.
When they happen, the 'weather' changes, but the 'climate' doesn't.

If you live in the right place, then you might get several blizzards every
Winter.  They're changes in the 'weather' but not in the 'climate'.

If the temperature where you live stays well below zero for a hundred
years, then you might be entering an ice age. 

Or let's say your town has had blizzards every Winter for the past 20 years
but it never had one for 100 years before that. 

Either of these would be a climatic change.  
5 0
4 years ago
Read 2 more answers
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