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Temka [501]
3 years ago
7

Which of the following are disadvantages of solar energy? Check all that apply. A. It contributes to global warming. B. It is ex

pensive. C. It is not equally effective for all areas of the world. D. It is not effective at all times of day.
Physics
1 answer:
guajiro [1.7K]3 years ago
8 0
B, C, and D.

Solar energy is green energy, it wouldn't contribute to global warming. However some places of the world don't receive as much sunlight (the poles) and at night you don't receive as much sunlight either. Solar energy is also very expensive to farm.
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What distinguishes a nebula and a star?
Kryger [21]

What distinguishes a nebula and a star is that a nebula is a cloud of gas and dust in outer space, visible in the night sky either as an indistinct bright patch or as a dark silhouette against other luminous matter. And a star is a<span> type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.</span>
4 0
4 years ago
Does the vertical or horizontal position affect an objects potential energy?
son4ous [18]
Yes. If an object would be vertical, it would most likely have potential energy due to gravity. 
6 0
3 years ago
What force is necessary to pull a 10 kg sled across a horizontal surface at a constant velocity if the coefficient of kinetic fr
Igoryamba

Answer:

Any force greater than 24.5 N

Explanation:

To find the frictional force is the 1st step. this can be found by multiplying the coefficient of friction and the normal force. normal force can be found by multiplying gravity (we will say 9.8 m/s/s) and the mass which is 10. You then multiply the result by the coefficient of friction which is 0.25 and it leads us to an answer to 24.5 N. This means that if you pull with exactly 24.5 N, the sled wouldnt move. So you need a force greater than 24.5 N and we have our answer.

I hope I helped correct me if im wrong

3 0
3 years ago
Why do the group 1 elements tend to become +1 ions
Likurg_2 [28]

because there small elemts like atoms but bigger than atoms we all know that


7 0
4 years ago
A radio-controlled car increases its kinetic energy from 3 J to 10 J over a distance of 1 m. What was the average net force on t
goldfiish [28.3K]

Answer:

Net force, F = 7 N

Explanation:

It is given that,

Initial kinetic energy of the car, K_i=3\ J

Final kinetic energy of the car, K_f=10\ J

Distance, d = 1 m

We need to find the average net force on the car during this interval. It is given by using the work energy theorem as :

W=\Delta K

W=K_f-K_i

Also, W = F.d    d = distance and F = net force

F.d=K_f-K_i

F=\dfrac{K_f-K_i}{d}

F=\dfrac{10\ J-3\ J}{1\ m}

F = 7 Newton

So, the average net force on the car during this interval is 7 newton. Hence, this is the required solution.

8 0
3 years ago
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