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sukhopar [10]
2 years ago
13

What are some downsides to fossil fuels? (Select all that apply.)

Physics
1 answer:
Evgen [1.6K]2 years ago
6 0

Answer:

They release large amounts of carbon dioxide when burned.

They are expensive to extract compared to other forms of energy.

They do not replenish themselves

Explanation:

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a microwave operates at a frequency of 2400 MHZ. the height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm. as
alexira [117]

Complete question is;

A microwave oven operates at a frequency of 2400 MHz. The height of the oven cavity is 25 cm and the base measures 30 cm by 30 cm. Assume that microwave energy is generated uniformly on the upper surface of the cavity and propagates directly

downward toward the base. The base is lined with a material that completely absorbs microwave energy. The total microwave energy content of the cavity is 0.50 mJ.

Answer:

Power ≈ 600,000 W

Explanation:

We are given;

Frequency; f = 2400 Hz

height of the oven cavity; h = 25 cm = 0.25 m

base area; A = 30 cm by 30 cm = 0.3m × 0.3m = 0.09 m²

total microwave energy content of the cavity; E = 0.50 mJ = 0.5 × 10^(-3) J

We want to find the power output and we know that formula for power is;

P = workdone/time taken

Formula for time here is;

t = h/c

Where c is speed of light = 3 × 10^(8) m/s

Thus;

t = 0.25/(3 × 10^(8))

t = 8.333 × 10^(-10) s

Thus;

Power = (0.5 × 10^(-3))/(8.333 × 10^(-10))

Power ≈ 600,000 W

3 0
3 years ago
The successive ionization energies for an unknown element are listed below. To which family in the periodic table does the unkno
bagirrra123 [75]
<span>The jump from 1966 to 16347 is the largest one or simply we can say it is hard to lose the 3rd electron.Whereas, it is relatively easy to lose the first two electrons.

So there will be only 2 electrons in the outer most shell.

According to the information mentioned above we can conclude the </span><span>unknown element likely belongs to the second group.
</span><span>I2 = 1752 kj/mol</span>
4 0
3 years ago
Read 2 more answers
Good morning! Can someone please answer this, ill give you brainliest and you will earn 50 points.
kicyunya [14]

Correct ones are

  • Technical improvements that have made alternative energy sources more practical to use
  • Increase in concern for environment.

why?

Fossil fuels are hydrocarbons

  • Hydrocarbons on burning with oxygen releases harmful carbon dioxide .
8 0
2 years ago
A wire is stretched just to its breaking point by a force F . A longer wire made of the same material has the same diameter. The
ICE Princess25 [194]

Answer: No

Explanation:

The force F required is equal to the Force exerted in stretching the first material since conditions are the same

8 0
3 years ago
Read 2 more answers
What two variables is acceleration dependent on?
Vaselesa [24]
The correct answer to this qustion is velocity and time
7 0
3 years ago
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