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4 years ago

What is one or two letter character used to identify an element

Physics

2 answers:

Greeley [361]4 years ago

4 0

A symbol of the element. hope this helps!!

Murljashka [212]4 years ago

3 0

Its the symbol it usually has the first letter of the elements name.<span />

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20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What's the new volu

boyakko [2]

It is given that that initial volume of gas is 20 cubic inches.

The initial pressure is given as 5 psi.

The final pressure is given as 10 psi

We are asked to calculate the final volume.

Let initial and final volume of gas is denoted as $v_{1} \ and\ v_{2}$

Let the initial and final pressure of gas is denoted as $p_{1} \ and\ p_{2}$

As per the question the temperature of a gas is constant.

From Boyle's law we know that pressure of a given mass of a gas is inversely proportional to the applied volume at constant temperature.

Hence mathematically

$p\ \alpha\ \frac{1}{v}$

$pv=constant$

$p_{1} v_{1} =p_{2} v_{2}$

$v_{2} =\frac{p_{1}v_{1} }{p_{2} }$

Putting the values of these respective quantities as mentioned above we get-

$v_{2} =\frac{5\ psi*20 cubic\ inches}{10\ psi}$

$=10\ cubic\ inches$ [ans]

8 0

3 years ago

Read 2 more answers

Can someone help me with #7

bekas [8.4K]

The ratio of (new volume / old volume) is the same as the ratio of (new temperature / old temp).

Just remember that you have to use the ABSOLUTE temperatures.

An absolute temperature is (Celsius + 273).

7 0

4 years ago

A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood?

Bingel [31]

Density review

A B

What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3? d = .85 g/cm3

A piece of wood that measures 3.0 cm by 6.0 cm by 4.0 cm has a mass of 80.0 grams. What is the density of the wood? Would the piece of wood float in water? (volume = L x W x H) d = 1.11 gm/cm3

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3 years ago

Light travels from medium X into medium Y. Medium Y has a higher index of refraction. Consider each statement below:(i) The ligh

ahrayia [7]

Answer:

i) FALSE, ii) TRUE, iii) FALSE, iv) FALSE

Explanation:

When light (electromagnetic radiation) travels through a material medium, its speed is less than the speed of light in a vacuum. If we define the index of parts

n = c / v

where v is the speed of light in the material medium.

The direction of the ray can be determined by the law of refraction

n₁ sin θ₁ = n₂ sin θ₂

Let's apply these equations to our case where

nₓ <n_y

i) The expression of the refractive index

nₓ < n_y

$\frac{c}{v_x} = \frac{c}{n_y}$

v_y <vₓ

therefore the expression is FALSE

ii) If we use the law of refraction, the light, when passing from a medium with a lower start to another with a higher index, must approach the normal one, away from what would be the continuation of the path of the incident ray

so the expression is TRUE

iii) The speed of light is constant in all material media

the statement is FALSE

iv) light approaches normal

Let me clarify that the normal is a line perpendicular to the surface at the point of contact, not the direction of Io.

the statement of FALSE

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3 years ago

A treasure map instructs you to walk (25.0+A) m south, followed by (18.0+B) m east, then 64.5 m north, and finally 28.5 m east.

adelina 88 [10]

Answer:

Explanation:

Check attachment for solutions

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3 years ago