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3 years ago

Why isn't iron used to make coin

Physics

2 answers:

AleksandrR [38]3 years ago

7 0

If iron were used to make coins then it would rust easily,because of its exposure to water, air etc..

Anna007 [38]3 years ago

7 0

Iron is highly reactive, particularly to oxygen and water. This means it will oxidize, or rust.

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Please select the word from the list that best fits the definition the name for continents in one landmass surrounded by giganti

frez [133]

Hello!

The name for continents in one landmass surrounded by gigantic ocean is Pangaea.

This name is originated from the Greek words Pan ("all") and Gaia ("Earth"). It describes the supercontinent that would have existed in the Cenozoic and Mesozoic periods by the joining of all continents that we know them today.

The gigantic ocean that surrounded it is called Panthalassa, from Greek Pan ("all") and thálassa ("sea").

Have a nice day!

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3 years ago

)If a force of 5.00 N is needed to open a 90.0 cm wide door when applied at the edge opposite the hinges, what force must be app

masha68 [24]

Answer:

A force of 12.857 newtons must be applied to open the door.

Explanation:

In this case, a force is exerted on the door, a moment is performed and the door is opened. If moment remains constant, the force is inversely proportional to distance respect to axis of rotation passing through hinges. That is:

$F \propto \frac{1}{r}$

$F = \frac{k}{r}$ (Eq. 1)

Where:

$F$ - Force, measured in newtons.

$k$ - Proportionality ratio, measured in newton-meters.

$r$ - Distance respect to axis of rotation passing through hinges, measured in meters.

From (Eq. 1) we get the following relationship and clear the final force within:

$F_{A}\cdot r_{A} = F_{B}\cdot r_{B}$

$F_{B}=\left(\frac{r_{A}}{r_{B}} \right)\cdot F_{A}$ (Eq. 2)

Where:

$F_{A}$ , $F_{B}$ - Initial and final forces, measured in newtons.

$r_{A}$ , $r_{B}$ - Initial and final distances, measured in meters.

If we know that $F_{A} = 5\,N$ , $r_{A} = 0.9\,m$ and $r_{B} = 0.35\,m$ , then final force is:

$F_{B}= \left(\frac{0.9\,m}{0.35\,m} \right)\cdot (5\,N)$

$F_{B} = 12.857\,N$

A force of 12.857 newtons must be applied to open the door.

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2 years ago

An object that is accelerating may be

Elenna [48]

It must be either speeding up, or slowing down, or turning. There are no other possibilities.

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2 years ago

Which planet will take the shortest revolution around the sun?

LUCKY_DIMON [66]

The planet closest to the sun; Mercury.

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3 years ago

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PLSS HELP WILL GIVE POINTS OR WHATEVER JUST PLS HELP I WILL GIVE 98 POINTS

galina1969 [7]

Answer:

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3 years ago