All categories

2 years ago

What is similar between seeing an object and seeing a shadows

Chemistry

1 answer:

Naya [18.7K]2 years ago

3 0

The similarity between seen an object and seeing a shadow is their shape.

The shape of shadow of an object is always similar with object.

If object is in standing position, its image also is in standing position. The size of the shadow sometime greater than the object or less than the object. It never same.

If object is in sitting position, its image also is in sitting position.

If the source of light is on the back side, the shadows formed is in our front side and always act opposite to our activity.

For example, if we raise your left hand, the shadow appear to be raise right hand.

If the source of light is on the front side, the shadows formed is in back side and always act similar like us.

For example: if we raise your left hand, the shadow also appear to be raise left hand.

Everything changes at different position of source of light but shape never changes.

Thus, we concluded that similarity between seen an object and seeing a shadow is their shape.

learn more about images:

brainly.com/question/12629638

#SPJ9

You might be interested in

Which choice confirms that one air mass is being replaced by another air mass in a given area?

Sedaia [141]

Answer:

Answer is A

Explanation:

Increase in wind

7 0

3 years ago

An unknown material has a mass of 5.75 g and a volume of 7.5 cm3.

Shtirlitz [24]

Hey there!:

Mass = 5.75 g

Volume = 7.5 cm³

Therefore:

Density = mass / volume

D = 5.75 / 7.5

D = 0.7 g/cm³

Answer C

Hope that helps!

3 0

3 years ago

Calculate the number of moles represented by 21.7 g fe.

fiasKO [112]

The correct option is (e) 0.389 moles.

The number of moles represented by 21.7 g fe 0.389 moles.

Solution:

(21.7g) x (1mol/55.85g) = 0.389 moles

<h3>What is moles?</h3>

The mole, represented by the symbol mol, is the fundamental SI unit of material quantity. The amount of a substance determines how many elementary entities of that substance are present in an object or sample. Since the SI fundamental units were revised in 2019, the mole is now exactly defined as 6.022140761023.

The amount of a substance determines how many elementary entities of that substance are present in an object or sample. Since the SI fundamental units were revised in 2019, the mole is now exactly defined as 6.022140761023.

To learn more about moles visit:

brainly.com/question/26416088

#SPJ4

4 0

2 years ago

A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too ha

lutik1710 [3]

Answer:

The release of methane from thawed permafrost.

Explanation:

The complete question is

A group of scientists in Alaska notices that not only have atmospheric CO2 levels increased at their sampling site but so too have methane levels. What could account for this increase in methane levels?

- None of the answer options is correct.

- The release of methane from thawed permafrost.

-A decrease in beef production near the researchers' sampling area.

-The melting of permafrost accompanied by the thawing of methane-producing bacteria.

-The failure of rice paddies to be established in Alaska, given its climate.

Permafrost regions like the arctic circle hold a large supply supply of methane in their soils and their seas. Ordinarily, this methane should be gradually released naturally over a long period of time, but the effects of global warming is making these permafrost to thaw at a much faster rate, accelerating the release of methane into the atmosphere. The dark side is that methane is about 80 times more deadly when compared to CO2 in its contribution to the green house effect on earth.

5 0

4 years ago

f 65mL of sulfuric acid and 25mL of sodium hydroxide were mixed and the solution had a density of 1.01g/mL, what is the heat of

user100 [1]

The question is incomplete, here is the complete question:

If 65 mL of sulfuric acid and 25 mL of sodium hydroxide were mixed and the solution had a density of 1.01 g/mL, What is the heat of the calorimeter in kJ given the temperature change of the above equation is -5.5 K. You may assume the solution has a heat capacity of 4.180 J/gK. Express your final answer in kJ and with 2 decimal places

<u>Answer:</u> The heat of the calorimeter is 2.09 kJ

<u>Explanation:</u>

To calculate the mass of solution, we use the equation:

$\text{Density of substance}=\frac{\text{Mass of substance}}{\text{Volume of substance}}$

Density of solution = 1.01 g/mL

Volume of solution = [65 + 25] mL = 90 mL

Putting values in above equation, we get:

$1.01g/mL=\frac{\text{Mass of solution}}{90mL}\\\\\text{Mass of solution}=(1.01g/mL\times 90mL)=90.9g$

To calculate the heat released by the reaction, we use the equation:

$q=mc\Delta T$

where,

q = heat released

m = mass of solution = 90.9 g

c = heat capacity of solution = 4.180 J/g.K

$\Delta T$ = change in temperature = -5.5 K

Putting values in above equation, we get:

$q=90.9g\times 4.180J/g.K\times (-5.5K)=-2089.8J=-2.09kJ$

Heat released by the solution will be equal to the heat absorbed by the calorimeter.

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

Heat absorbed by the calorimeter = -(-2.09) = 2.09 kJ

Hence, the heat of the calorimeter is 2.09 kJ

8 0

4 years ago