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3 years ago

6

When electricity is produced from coal, the chemical energy in coal is first changed to thermal energy. True or False

1 answer:

Degger [83]3 years ago

3 0

It is true. because it... umm. uhh yea

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Which number label represents the nucleus? 6,5,3,2

vazorg [7]

Answer:

5

Explanation:

Nucleus is the center or "CEO" of the cell, that holds the cell's DNA and controls the cells' function.

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3 years ago

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Will give brainly/ How many stars are in the Solar System?

Fantom [35]

Answer:

1 star

Explanation:

the one star is the sun

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3 years ago

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What is the volume of a balloon of gas at 842 mm Hg and -23° C, if its volume is 915 mL at a pressure of 1,170 mm Hg and a tempe

garik1379 [7]

Answer:
V₂ = 1070 mL or 1.07 L

Solution:

Data Given;
P₁ = 1170 mmHg

V₁ = 915 mL

T₁ = 24 °C + 273 K = 297 K

P₂ = 842 mmHg

V₂ = ?

T₂ = - 23 °C + 273 K = 250 K

According to Ideal gas equation,

P₁ V₁ / T₁ = P₂ V₂ / T₂

Solving for V₂,

V₂ = P₁ V₁ T₂ / P₂ T₁

Putting Values,

V₂ = (1170 mmHg × 915 mL × 250 K) ÷ (842 mmHg × 297 K)

V₂ = 1070 mL or 1.07 L

5 0

3 years ago

. What is the density of a block of plastic if the volume of the block is 5 cm and the mass is 17.2 g?

stellarik [79]

Answer:

<h3>The answer is 3.44 g/cm³</h3>

Explanation:

The density of a substance can be found by using the formula

$density = \frac{mass}{volume} \\$

From the question

mass = 17.2 g

volume = 5 cm³

We have

$density = \frac{17.2}{5} \\$

We have the final answer as

<h3>3.44 g/cm³</h3>

Hope this helps you

5 0

3 years ago

What is the wavelength of light with 2.89 x 10-19 J of energy? (The speed of

Alika [10]

Let's see

$\\ \rm\rightarrowtail E=hv$

$\\ \rm\rightarrowtail E=\dfrac{hc}{\lambda}$

lambda is wavelength
h is Planck constant
c is velocity of sound in air
E in energy

$\\ \rm\rightarrowtail \lambda=\dfrac{hc}{E}$

$\\ \rm\rightarrowtail \lambda=\dfrac{6.626\times 10^{-34}\times 3\times 10^8}{2.89\times 10^{-19}}$

$\\ \rm\rightarrowtail \lambda=6.878\times 10^{-7}m$

$\\ \rm\rightarrowtail \lambda=68.8\mu m$

3 0

2 years ago