What are the dark areas on the surface of the Sun?

2 answers:

4 0

Sunspots,despite being called sunspots they are still thousands of degrees hot with an average cycle of 11years per minimum and the climax of these phenomenon s

Bas_tet [7]3 years ago

4 0

<h3><u>Answer;</u></h3>

Sunspots

<h3><u>Explanation;</u></h3>

Sunspots are areas on the surface of the sun that occurs in pairs since each is one side of a loop of the sun's magnetic field which reaches the surface of the sun.
<u>Sunspots are cooler and darker than the rest of the Sun's surface and are marked by intense magnetic activity.</u>
Sunspot are created by the strong, dense magnetic fields that are generated by circulating plasma which become entangled and surge through the photosphere.

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A miner of mass 90kg travels down a slide calculate the potential energy of the miner when he moves15m vertically downwards

Lena [83]

Answer:

Gravitational Potential Energy = mgh

Explanation:

As the miner moves down, the GPE changes because the height changes.

Gravitational Potential Energy = mgh

8 0

3 years ago

Dina has a mass of 50 kilograms and is waiting at the top of a ski slope that’s 5.0 meters high.

Over [174]

All of Dina's potential energy Ep is converted into kinetic energy Ek so Ep=Ek, where Ep=m*g*h and Ek=(1/2)*m*v². m is the mass of Dina, h is the height of ski slope, g=9.8 m/s² and v is the maximal velocity.

So we solve for v:

m*g*h=(1/2)*m*v², masses cancel out,

g*h=(1/2)*v², we multiply by 2,

2*g*h=v² and take the square root to get v

√(2*g*h)=v, we plug in the numbers and get:

v=9.9 m/s.

So Dina's maximum velocity on the bottom of the ski slope is v=9.9 m/s.

8 0

2 years ago

Read 2 more answers

A body is dropped from the roof of a 20 m high building by how much:

USPshnik [31]

Answer:

t = 2.01 s

Vf = 19.7 m/s

Explanation:

It's know through the International System that the earth's gravity is 9.8 m/s², then we have;

Data: