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brilliants [131]
3 years ago
15

What is the ultimate source of energy for an ecosystem?

Physics
1 answer:
Romashka-Z-Leto [24]3 years ago
4 0

Answer:

Obviously the answer is Sun...

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A wire carries a current of 4.1 A. How many electrons per second are passing any cross sectional area of the wire? Enter your an
aivan3 [116]

To solve this problem it is necessary to apply the concepts related to Current and Load.

The current in terms of the charge of an electron can be expressed as

i = \frac{q}{t}

Where,

q = Charge

t = time

At the same time the Charge is the amount of electrons multiplied by the amount of these, that is

q = ne

Replacing in the first equation we have to

i = \frac{q}{t}

i = \frac{ne}{t}

Clearing n,

n = \frac{it}{e}

Here the time is one second then

n = \frac{i}{e}

n = \frac{4.1}{1.6*10^{-9}}

n = 2.56*10^{19}electrons

Therefore the number of electrons per second are passing any cross sectional area of the wire are 2.56*10^{19}electrons

3 0
3 years ago
If a steel containing 1.88 wt%C is cooled relatively slowly to room temperature, what is the expected weight fraction of pearlit
Oxana [17]

Answer:

The answer is %pearlite = 0.06%

Explanation:

according to the exercise we have that the percentage is 1.88% C, therefore, the percentage of perlite is equal to:

%pearlite = (B*C)/(A*C) = (2-1.88)/(2-0) = 0.06%

The percentage of cementite is equal to:

%cementite = (1.88-0)/(2-0) = 0.94%

4 0
3 years ago
Wich of the following celestial bodies is most likely to have many craters
Ede4ka [16]
Where are the following awnsers?
6 0
3 years ago
Most of the really bright stars in our sky are NOT among the stars that are very close to us. Why then do they look so bright to
Yanka [14]

Answer:

stars will emit more light due to their Luminosity, so they look very bright.

Explanation:

Luminous refers to..,

  • The total amount of energy radiated by a star or other celestial object per second.
  • Therefore it is the power output of a star.

Most of the really bright stars in our sky are not that very close to us yet they look bright because of the Luminosity of the star.

These stars are intrinsically so luminous.

A star's power output across all wavelengths is called its bolometric luminosity.

A star with large luminosity will have more measure of radiated electromagnetic power meaning.

so it will emit more light than a low luminosity star.

Hence,

those stars can easily be seen even across great distance.

learn more about  Luminosity of the star here:

<u>brainly.com/question/13912549</u>

<u />

#SPJ4

6 0
2 years ago
For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 78kg adult receive?
kari74 [83]
RDA stands for Recommended Daily Allowance. To determine the amount needed of a certain adult per day, we simply multiply the mass of the adult to the value of RDA. For this case, we do as follows:

Daily requirement = 12 mg/kg ( 78 kg ) = 936 mg of lysine = 936000 g
6 0
3 years ago
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