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lora16 [44]
2 years ago
15

Emily learns that ancient astronomers, such as Ptolemy, created a model of the solar system based only on what they could see wi

th their eyes. Describe Ptolemy's model of the solar system and how he came to his conclusions. Then describe Galileo's model of the solar system. Explain how Galileo proved that his model was correct and that Ptolemy’s was not correct.
Chemistry
1 answer:
sergey [27]2 years ago
7 0

Explanation:

Galileo found Venus went through the entire phase cycle, proving that she revolved completely around the Sun, as predicted by Copernicus in his heliocentric model. ... The phases of Venus could not be explained by Ptolemy's Geocentric Model. Galileo knew that the Roman Catholic Church was incorrect.

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A sample of metal had a mass of 17.29g and a volume of 5.68mL what is the density of this metal
Gennadij [26K]
Density = mass/volume

<span>17.29g / 5.68mL = 3.044g/mL</span>
8 0
3 years ago
Formic acid (HCOOH) is secreted by ants. Calculate [H3O+] for a 1.17E-2 M aqueous solution of formic acid (Ka = 1.80E-4).
NeTakaya
HCOOH + H2O <---> HCOO- + H3O+ 

<span>Ka = 1.8 X 10^-4 = [HCOO-][H3O+] / [HCOOH] </span>

<span>In the solution, [HCOO-] = [H3O+] = x </span>
<span>Quite properly, [HCOOH] = (2.30 X 10^-3 - x). </span>

<span>Since the formic acid solution is pretty dilute, and since Ka is sort of small, we can initially assume that x will be small compared to 2.3 X 10^-3, and so we can ignore it. If we do that, then, </span>

<span>Ka = x^2 / 2.30X10^-3 = 1.80 X 10^-4 </span>
<span>x = 6.4 X 10^-4 = [H3O+] </span>
<span>pH = 3.19 </span>

<span>Now, quite properly, our assumption that x would be small compared to 2.3 X 10^-3 is incorrect, and we really cannot ignore x in that expression. So, we should go back to the original expression for Ka: </span>

<span>Ka = x^2 / (2.30 X 10^-3 - x) = 1.80 X 10^-4 </span>

<span>Quite properly, you should rearrange this into a quadratic form and use the quadratic equation to solve for x. Once you've done that, x = [H3O+], and pH = - log (x).</span>
3 0
3 years ago
A planet similar to Earth has four moons roughly the same distance away. The moon that will MOST affect tides on the planet is t
WITCHER [35]
I not that sure but it C
7 0
3 years ago
Read 2 more answers
08 03 M
kvv77 [185]

Answer:

The star is a special star

Explanation:

it is a binary star it is dominated by a luminous main sequence of star! it has a magnitude of -1.46. Sirius A's apparent bright ness can be attributed both to its inherited luminosity! 20 times that of thr sun anf its proximity. At just 8.7 Light years away sirius is the seventh closest star to earth.

5 0
3 years ago
As of January 2009, the USA has produced 60,000 metric tons of nuclear waste in 60 yesrs of operating 104 nuclear power plants.
goblinko [34]

Answer:  a. 0.8 tons p. month.

Explanation:

Given: Total nuclear waste = 60,000 metric tons

Time take = 60 years = 12 x 60 months   [ 1 year = 12 months]

=  720 months

Total nuclear power plants = 104

Now , Average  waste produced by each plant = \dfrac{\text{Total waste}}{\text{Time x Number of plants}}

=\dfrac{60000}{720\times104}\approx0.8\text{ tons per month.}

Hence, 0.8 tons p. month is produced by each plant.

So, option a. is correct.

5 0
2 years ago
Read 2 more answers
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