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pychu [463]
3 years ago
13

A state government is trying to decide what type of energy its state should rely on for electricity in the future. Which of the

following is a benefit associated with the use of coal power that the government should take into consideration?
A.Coal power plants release toxic chemicals into the air
B.Mining for coal hurts the environment
C.Coal power can be generated both day and night
D.Burning coal releases greenhouse gases
Physics
2 answers:
Irina-Kira [14]3 years ago
7 0
Answer choice C is a benefit of coal; all the others are negatives.

Feel free to ask me more questions; I'm happy to help. (Don't forget Brainliest!)
fgiga [73]3 years ago
4 0

Answer: C. Coal power can be generated both day and night.

Explanation:

Coal is an important form of source of energy. It is a non-renewable source of energy. It is obtain by mining of the surface below the earth crust.  Coal plays an important role in generation of electricity worldwide.  

It acts as a raw material for the generation of electricity in both day and night. When the coal is turned into a gas. The gas turbine is hot enough to boil the water that can be used to make the steam. The steam spin another type of turbine so as to generate the electricity.

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Why is it impossible to create a perpetual motion machine?
Tatiana [17]

Answer:

It is impossible to create a perpetual motion machine because some of the energy will always be lost in the conversion  and therefore it will eventually stop.

Correct Answer : Option B

Explanation:

The perpetual motion machine is impossible machine as it is hypothetical working machine which would be in motion for an indefinite time in continuity of the motion. The continuity of motion for an indefinite time would mean that the working principle of the machine would never allow the dissipation of energy from the machine and all the machine would ultimately reserve all the energy and be converting it into forms without any loss.

This working principle is violation of first and second laws of thermodynamics and hence a machine will eventually lose some of its energy in every conversion of the working cycle and hence there will be a time where the machine would be stopped, and hence a perpetual motion machine cannot be made.

8 0
3 years ago
The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of
Orlov [11]
Because 2 carbon attach to one's of each of the others
4 0
3 years ago
You apply a net force on a soccer ball of 15 N. If the acceleration it has is 5 m/s2 what is the mass of the ball?​
Ipatiy [6.2K]

Answer:

<h2>3 kg </h2>

Explanation:

The mass of the ball can be found by using the formula

m =  \frac{f}{a}  \\

f is the force

a is the acceleration

We have

m =  \frac{15}{5}  = 3 \\

We have the final answer as

<h3>3 kg</h3>

Hope this helps you

4 0
2 years ago
Why has the model of the atom changed over time?
Makovka662 [10]
<span>A.
The model of the atom evolved as scientists have made new discoveries.</span>
7 0
2 years ago
A satellite, orbiting the earth at the equator at an altitude of 400 km, has an antenna that can be modeled as a 1.76-m-long rod
ivann1987 [24]

Answer:

The inducerd emf is 1.08 V

Solution:

As per the question:

Altitude of the satellite, H = 400 km

Length of the antenna, l = 1.76 m

Magnetic field, B = 8.0\times 10^{- 5}\ T

Now,

When a conducting rod moves in a uniform magnetic field linearly with velocity, v, then the potential difference due to its motion is given by:

e = - l(vec{v}\times \vec{B})

Here, velocity v is perpendicular to the rod

Thus

e = lvB           (1)

For the orbital velocity of the satellite at an altitude, H:

v = \sqrt{\frac{Gm_{E}}{R_{E}} + H}

where

G = Gravitational constant

m_{e} = 5.972\times 10^{24}\ kg = mass of earth

R_{E} = 6371\ km = radius of earth

v = \sqrt{\frac{6.67\times 10^{- 11}\times 5.972\times 10^{24}}{6371\times 1000 + 400\times 1000} = 7670.018\ m/s

Using this value value in eqn (1):

e = 1.76\times 7670.018\times 8.0\times 10^{- 5} = 1.08\ V

5 0
3 years ago
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