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3 years ago

PLEASE ANSWER QUICK GIVING BRAINLIEST TO THE ONE WHO ANSWERS

Physics

2 answers:

Ierofanga [76]3 years ago

6 0

Answer:

iron combines with oxygen to produce rust, which is the compound named iron oxide.

Explanation:

dedylja [7]3 years ago

4 0

Answer: Iron combines with oxygen to produce rust, which is the compound named iron oxide.

Explanation: Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

Hope This Helps :)

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What came first the chicken or the egg

maxonik [38]

Answer:

The Egg

Explanation:

personally the Chicken who would lay the egg would have to come from an Egg itself, then It would have to grow up and then Produce an egg that will produce a chicken and so on.

6 0

3 years ago

The sound from a loud speaker has an intensity level of 80 db at a distance of 2.0m. Consider the speaker to be a point source,

Tamiku [17]

Answer:

2.83m

Explanation:

The information that we have is

Intensity at 2.0 m: $I=80dB$ and $r_{1}=2m$

we need an intensity level of: $I_{2}=40dB$

thus, we are looking for the distance $r_{2}$ .

which we can find with the law for intensity and distance:

$(\frac{r_{2}}{r_{1}} )^2=\frac{I_{1}}{I_{2}}$

we solve for $r_{2}$ :

$\frac{r_{2}}{r_{1}}=\sqrt{\frac{I_{1}}{I_{2}} }\\\\r_{2}=r_{1}\sqrt{\frac{I_{1}}{I_{2}} }$

and we substitute the known values:

$r_{2}=(2m)\sqrt{\frac{80dB}{40dB} }\\\\r_{2}=(2m)\sqrt{2}\\ r_{2}=2.83m$

at a distance of 2.83m the intensity level is 40dB

5 0

3 years ago

Complete this sentence. The solubility of a sample with ______ when the size of the sample increases

jeka57 [31]

stays the same

please mark as brainliest <3

6 0

3 years ago

Which characteristic accounts for the fact that red lights are used in dark rooms and DO NOT expose negatives during developing?

Svetllana [295]

Answer:

low energy

Explanation:

They use low amounts of energy and don't affect the developing process. The chemicals used and the negative film are affected by regular light and it can destroy the pictures and the development. The red light prevents chemical processes that destroy the photos and that's why it is used in dark rooms.

Hope this was helpful

3 0

3 years ago

Read 2 more answers

The temperature inside a Carnot refrigerator placed in a kitchen at 22 degree Celcius is 2 degree Celcius. The heat extracted fr

Elanso [62]

Answer: 1.79 kW

Explanation:

Given

The temperature of the refrigerator is $T_L=2^{\circ}C\approx 275\ K$

The temperature of the kitchen is $T_H=22^{\circ}C$

COP of the refrigerator is

$COP=\dfrac{T_L}{T_H-T_L}=\dfrac{\text{Desired effect}}{\text{Power}}\\\\\Rightarrow COP=\dfrac{275}{22-2}=\dfrac{89}{P}\\\\\Rightarrow P=\dfrac{20}{275}\times 89=6.47\ MJ/h\ \text{or}\ 1.79\ kW$

4 0

3 years ago