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sukhopar [10]
3 years ago
12

Two students are discussing the Sun. Which student is correct? Student 1: Nuclear fusion powers the Sun, so activity like sunspo

ts and flares must be caused by a change in the fusion rate or the type of fusion. Student 2: Fusion is constant, keeping the Sun a nice temperature; changes on the surface are caused by the Sun's magnetic field.
Physics
1 answer:
timofeeve [1]3 years ago
3 0

Answer:

Both student are correct.

Explanation:

Given :

Student 1: Nuclear fusion powers the Sun, so activity like sunspots and flares must be caused by a change in the fusion rate or the type of fusion.

Student 2: Fusion is constant, keeping the Sun a nice temperature; changes on the surface are caused by the Sun's magnetic field

There are two types of nuclear reaction,

Fusion:

Two lighter atom combine together are produce new atom.

In case of fusion large amount of energy produces and fusion powers the sun. In case of sun two hydrogen atom combine together and helium produces so statement 1 is true.

Sun posses large magnetic field due to magnetic field sun spot created like magnet there are two poles N and S, magnetic field lines goes from N to S.

Sun spot are produces because of change in magnetic field and change in temperature. So statement 2 is also true.

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In a physics lab, a 60-kg student runs up a 2.0-meter tall flight of stairs in 1.5 seconds. The work done to get to the top is 1
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<span>The student's power rating is approximately 800W.
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Power is the rate of doing work. Its SI unit is Watt. 1 W = 1J/sec

Given: <span>The work done to get to the top is 1200 Joules
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Time = 1.5 seconds.

Power = \frac{work done}{time} &#10;=  \frac{1200J}{1.5 sec} &#10;= 800J/sec &#10;= 800W
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4 years ago
Mariyam, a marine biologist, measures the length of a great white shark at 4.5 m long and its teeth at an average of 50 mm long.
TiliK225 [7]
The length should be 450 cm 
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3 years ago
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4. Which of the following would be a good reference point to describe the motion of a dog?
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ANOTHER RUNNING DOG

Explanation:

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Because the motion of dog is in the linear with respect to the another dog and to the acceleration produced by the dog in the required interval is easy to calculate with respect to  another dog which is already in motion.

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What is wrong with the following statement: When you exert a force on a baseball, the equal and opposite force on the ball balan
chubhunter [2.5K]

Answer:

When you exert a force on a baseball, there exists an equal and opposite force on the ball therefore, the ball will accelerate in opposite direction.

Explanation:

When you hit a ball with baseball bat, the bat exerts a great force on the ball which causes the ball to accelerate in the opposite direction. It is to be noted that the mass of bat is much greater than mass of ball but the acceleration of ball is also greater than the acceleration of the bat so both bat and ball almost exert same magnitude of force but in opposite direction and as a result both bat and ball accelerate in opposite direction, the deciding factor is of course the relative force applied by the batter and the bowler.

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3 years ago
An AC circuit has an RMS voltage of 80 VAC. What's the circuit's average voltage?
yaroslaw [1]

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So the peak value is (√2) x (RMS value)

-- The Average value of an AC waveform is (2/π) x (peak value)

So the peak value is (π/2) x (Average value).

-- So far, this is all very entertaining, but how does it help us answer the question.

Well, we found the peak value in terms of the RMS and in terms of the Average.  So we can set these equal to each other, and solve for the Average in terms of the RMS.  This sounds like such a good plan, I think I'll do it !

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You said that the RMS value is 80 V, so

Average = (2/π) · (√2) · (80)

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Average = 160√2 / π

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Now I'll go ahead and tell you the 'gotcha':

All of these numbers are true, as far as they go.  But the 'average' is only true for 1/2 cycle of an AC wave.  Picture an AC wave in your mind.  You'll see that it spends just as much time being negative as it spends being positive.  So the 'average' of any number of AC <em><u>whole cycles</u></em> is <em>zero.</em>

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