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3 years ago

7

Multicellular plants and animals have organs to perform specific functions.What do eukaryotic cells have to perform specific fun

ctions

1 answer:

Morgarella [4.7K]3 years ago

4 0

organelles perform specific functions in cells

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In a certain city, electricity costs $0.17 per kW·h. What is the annual cost for electricity to power a lamp-post for 5.50 hours

Anon25 [30]

Answer:

(a) = $34.123

(b) = $8.532

(c) Additional cost of fluorescent bulb is justified

Explanation:

Cost of electricity = $0.17 per kW·h

(a) For a 100 watt bulb which is the same as 100/1000 or 0.1 kW, the cost per hour =

0.1 × 0.17 = $0.017/h

and for 5.5 hours = 0.017×5.5 = $0.0935

The annual cost, which is 365 days, we have

Annual cost = $0.0935 × 365 = $34.123

(b) For the energy efficient 25-watt bulb, we have

25/1000 = 0.025kW

Power cost per annum =

0.025kW×$0.17 per kW·h×5.5×365 = $8.532

(c) Total cost of incandescent bulb = $0.89 total cost of using the incandescent bulb is $34.123 + $0.89 = $35.02

Total cost of using the energy efficient fluorescent bulb is about $3.49

Total cost of using the energy efficient bulb = $8.532 + $3.49 = $12.02

Total cost of incandescent bulb = $35.02 while total cost of energy efficient bulb is = $12.02

$12.02 <$35.02

Additional cost of fluorescent bulb is justified

8 0

4 years ago

If aqueous solutions of Na2SO4 and BaCl2 are mixed, does a precipitate form? If yes, identify the precipitate and the spectator

Sergeeva-Olga [200]

Answer:- A precipitate of $BaSO_4$ is formed and the spectator ions are $Na^+$ and $Cl^-$ .

Explanations:- A double replacement reaction takes place. In double replacement reaction, the ion exchange takes place and we write the products. Then we use the solubility chart to check if a precipitate forms.

The balanced molecular equation is:

$Na_2SO_4(aq)+BaCl_2(aq)\rightarrow 2NaCl(aq)+BaSO_4(s)$

From solubility chart barium sulfate is insoluble so its precipitate is formed. sodium and chlorine ions are spectator ions as shown in the below ionic equation.

$2Na^+(aq)+SO_4^-^2(aq)+Ba^+^2(aq)+2Cl^-(aq)\rightarrow 2Na^+(aq)+2Cl^-(aq)+BaSO_4(s)$

The net ionic equation is:

$SO_4^-^2(aq)+Ba^+^2(aq)\rightarrow BaSO_4(s)$

So, the spectator ions are $Na^+$ and $Cl^-$ and a precipitate of $BaSO_4$ is formed.

6 0

3 years ago

Use evidence from the "listening to earth" article and your physical models to answer the investigation question: what happens t

timofeeve [1]

Oceanic crust is frequently pushed into the mantle near convergent plate borders, where it starts to melt. Granite, the rock that forms the continents, is formed as magma rises into and through the other plate.

Therefore, at convergent borders, oceanic and continental crust are annihilated.

<h3>What is a diverging plate boundary?</h3>

When plates are spreading apart, new oceanic crust is being created to fill the space left behind. Most divergent boundaries are observed around mid-ocean oceanic ridges (although some are on land).

The mountains would keep eroding over the next few million years, but since there wouldn't be any tectonic activity to renew them, they would gradually erode down to low rolling hills. This would result in far less fascinating geography and a flatter planet overall.

Learn more about diverging plate refer

brainly.com/question/20458241

#SPJ4

5 0

1 year ago

Heat energy that is lost cannot usually be used to produce work.<br><br> True False

Veseljchak [2.6K]

Answer:

true

Explanation:

thanks for free point

7 0

3 years ago

The empirical formula for a compound is C2H4NO. If its molar mass is 232.2 g/mol, what is the molecular formula of the compound?

Irina18 [472]

Empirical formula mass

C2H4NO
2(12)+4(1)+14+16
30+24+4
58g/mol

Molar mass=232.2g/mol

Find n

Molar mass/Empirical formula mass
232.2/58
4

Molecular formula

n×Empirical formula
4(C2H4NO)
C8H16(NO)_4

4 0

2 years ago