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ASHA 777 [7]
3 years ago
12

If you have a vloume of 55l and a density of 2kg/l what is the mass

Biology
1 answer:
dolphi86 [110]3 years ago
8 0

Answer:

110 kg

Explanation:

Density = Mass / Volume ===> Mass = Density x Volume

Now follow the given:

- Density = 2 kg/L or 2000 g/L

- Volume = 55 L

Apply the rule:

Mass = 55 L x 2 kg/L = 110 kg or 110000 g. ( Liters is cancelled by Liters).

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In 1985 a biologist counted 750 pine trees in a 250 hectare forest. Using similar counting techniques, the biologist counted 1,2
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Answer:

Suppose that we have a given function f(x)

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a) We want to find the average (rate) of change on the size of population from 1985 to 1995.

We have that:

f(1985) = 750

f(1995) = 1500

Then we have:

r = \frac{1500 - 750}{1995 - 1985}  = 750/10 = 75

This means that the population of trees increases, in average, at a rate of 75 trees per year.

b) What is the density of trees each year that they were counted?

This will be equal to the quotient between the number of trees and the area.

1985: number of trees = 750 pines

         area = 250 ha

Then the density is:

D(1985) = (750 pines)/(250 ha) = 3 pines/ha

So 1985, there were 3 pines per hectare.

1990: number of trees = 1250 pines

         area = 250 ha

Then the density is:

D(1990) = (1250 pines)/(250 ha) = 5 pines/ha

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         area = 250 ha

The density is:

D(1995) = (1500 pines)/(250 ha) = 6 pines/ha

3) now we want to get the average change between 1985 and 1995 in the density, this will be:

r = \frac{D(1995) - D(1885)}{1995 - 1985}  = \frac{6 pines/ha - 3pines/ha}{10}  = 0.3 pines/ha

So, on average, each year the number of pines per hectare increases by 0.3

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Determine ATP structure
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