Light travels at precisely <span>299,792,458 metres every second (abbreviated to 3 x 10^8 metres every second but let's be precise)
There are 60 seconds in every minute (</span><span>299 792 458 x 60 = 17,987,547,480m)
60 minutes in every hour (17,987,547,480 x 60 = 1,079,252,849,000m)
96 hours in 4 days (</span><span>1,079,252,849,000 x 96 = 10,360,827,350,000m)
</span><span>Now let's convert to km to make this number (slightly) more manageable
(</span>10,360,827,350,000 / 1000 = <span>103,608,273,500km)
</span>Light travels <span>103,608,273,500km in 4 days - that's the equivalent of going around the equator of the earth 813,124 times!</span><span>
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Answer:
Water and sanitation services contribute to greenhouse gas emissions. Choice of wastewater treatment technologies, improved pumping efficiency, use of renewable sources of energy, and within-system generation of energy offer potential for reducing emissions.
Explanation:
Answer:
Specific heat capacity of aluminium is 0,863 J/g°C
Explanation:
<em>Values: 250g of water, aluminum sample starts off at 91.3°C, water starts off at 16.0°C, temperature of the water stops changing it's 19.5°C</em>
In this problem, the heat produced for the aluminium is the same consumed by water. The heat consumed by water is:
Q = C×m×ΔT <em>(1)</em>
Where C is specific heat of water (4,184J/g°C), m is mass of water (250,0g) and ΔT is change in temperature of water (19,5°C-16,0°C = 3,5°C)
Replacing:
Q = 4,184J/g°C×250,0g×3,5°C
<em><u>Q = 3661 J</u></em>
Using (1), it is possible to obtain specific heat of aluminium, thus:
Q / (m×ΔT) = C
Where Q is heat (3661J), m is mass (59,1g) and ΔT is change in temperature (91,3°C - 19,5°C( = 71,8°C
Replacing:
3661J / (59,1g×71,8°C) = C
<em>C = 0,863 J/g°C</em>
I hope it helps!
Answer:
I really don't know but I guess
Explanation:
2.7 would be the answer or 2.70
The concentration of iron in ppb is 5.2 ppb
In atmospheric chemistry, PPM( parts per million) and PPB( parts per billion) units are used to express the concentration of gases. PPB stands for parts per billion, while PPM stands for parts of gas per million parts of air.
2.6 × 10⁻⁶ grams of iron in 500 ml of water.
Now, converting milliliter into liter:
500 mL = 500 mL × ( 1L / 1000 mL ) = 0.5 L
Now for ppm, mass must be in mg.
2.6 × 10⁻⁶ grams = 2.6 × 10⁻⁶ grams × ( 1000 mg / 1 grams ) = 2.6 × 10⁻³ mg
Then, the concentration of iron in ppm will be:
2.6 × 10⁻³ mg / 0.5 L = 5.2 × 10⁻³ ppm
Now, 1 ppm = 1000 ppb
Therefore,
5.2 × 10⁻³ ppm × 10³ = 5.2 ppb
Learn more about concentration here:
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