3 years ago

Please anwser it will rate and will give brainly if. 2 people anwser it

1 answer:

3 0

The paper clips will magnetically connect to the nail. With the copper wire wrapped around then nail, it makes a magnetic field that, when powered will cause metal objects to come toward it, hence why it is called an "electromagnet".

Hope this helps!!!

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Butter melt when you heat it in a pan on the stove. Is this a chemical change or physical change? How can you tell?

choli [55]

It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.

4 0

3 years ago

4.564000 x 10^-4 express how many significant figures

Vaselesa [24]

Answer: 7

Explanation:

Before a number but after a decimal. The zeros at the end would usually mean that it doesn't count but since the numbers are before the zeros and after a decimal it's 7 sig figs

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3 years ago

What are examples of inferred energy?

Kisachek [45]

Using a stove to heat up water.

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3 years ago

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A serving of Cheez-Its releases 130 kcal (1 kcal = 4.18 kJ) when digested by your body. If this same amount of energy were trans

Brut [27]

The final temperature : 78.925°C

<h3>Further explanation </h3>

Heat can be calculated using the formula:

Q = mc∆T

Q = heat, J

m = mass, g

c = specific heat, joules / g ° C

∆T = temperature difference, ° C / K

Energy releases = 130 kcal = 130 x 4.18 kJ=543.4 kJ

The final temperature :

$\tt \Delta T=\dfrac{Q}{m.c}\\\\\Delta T=\dfrac{543.4}{2.5\times 4.186~kJ/kg^oC}\\\\\Delta T=51.925^oC$

Final temperature :

ΔT=final-initial

51.925°c=final-27°c

final = 51.925+27=78.925°C

7 0

2 years ago

Krupton (Kr) is a <br><br>A. Gas<br>B. Metal<br>C. Non of these<br>D. Metalloid

Katarina [22]

B is gas

The chemical element krypton is classed as a noble gas and a nonmetal.

Love you

3 0

3 years ago