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Delvig [45]
3 years ago
8

3. Which of the following statements about features on the sun is true?

Physics
2 answers:
EleoNora [17]3 years ago
8 0
Let's see your options:

a) prominences are gas eruptions that can form an arch and do not look dark, therefore this statement is false;
<span>b) solar flares</span> are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface, therefore this statement is true;
c) the number of sunspots may vary following an 11 years cycle, therefore this statement is false;
d) sunspots are colder spots on the surface and have nothing to do with solar winds, therefore this statement is false.

Readme [11.4K]3 years ago
5 0
Correct answer choice is:

b) Solar flares are spots hotter than the surrounding, therefore they are brighter than the rest, and they form where prominences start or end on the surface.

Solar flares eject coronal mass, they eject electrons, protons, and ions from the Sun. They<span> produce high energy particles and radiation that are dangerous to living organisms. </span>The earth encompasses a natural protection against these charged particles. Earth's magnetic field and atmosphere protect us from these particles.
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photoshop1234 [79]
H3 in reaction: NH3 + H2O→NH4 + OH- 
<span>The NH3 has gained an H - it is a base 
true</span>
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3 years ago
What is 1 + 2 -3 +5 - 10​
e-lub [12.9K]
-5 is the correct answer for this!
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3 years ago
A 5.0 kg box is sliding across a waxed floor by the application of a 15 N east force. If the force of friction is 2.5 N west, wh
coldgirl [10]

1) 12.5 N east

There are two forces acting on the box along the horizontal direction:

- The applied force of 15 N east, we indicate it with F

- The force of friction of 2.5 N west, we indicate it with F_f

Taking east as positive direction, we can write the two forces has

F=+15 N\\F_f = -2.5 N

Therefore, the net force on the box will be:

F_{net} = F + F_f = 15 + (-2.5) = +12.5 N

And the positive sign means the direction is east.

2) 2.5 m/s^2

We can solve this part by using Newton's second law:

F_{net}=ma

where

F_{net} is the net force on the box

m is its mass

a is the acceleration

For the box in this problem,

F_{net} = 12.5 m/s^2 (east)

m = 5.0 kg

Solving for a, we find the acceleration:

a=\frac{F_{net}}{m}=\frac{12.5}{5.0}=2.5 m/s^2

And the direction is the same as the net force (east)

6 0
3 years ago
Determine the mechanical energy of this object. A 2 kg pendelum has a speed of 1 m/s at a height of 1/2 meter
Readme [11.4K]

Mechanical Energy: 10.81 J given that g = 9.81 \; \text{m}\cdot\text{s}^{-2}.

<h3>Explanation</h3>

The mechanical energy of an object is the sum of its kinetic and potential energy.

Kinetic Energy of this object:

\text{KE} = \dfrac{1}{2} \; m \cdot v^{2} = \dfrac{1}{2} \times 2 \times 1 = 1 \; \text{J}

Gravitational Potential Energy of this object:

g = 9.81 \; \text{m}\cdot\text{s}^{-2}.

\text{PE} = m \cdot g \cdot h = 2 \times 9.81 \times \dfrac{1}{2} = 9.81 \; \text{J}.

8 0
2 years ago
How long did it take beagle to sail from Tahiti back to Falmouth, England?
Radda [10]

Answer:

On 2 October 1836, the Beagle entered the English port of Falmouth after a voyage which had lasted for four years, nine months and five days.

5 0
2 years ago
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