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Lelu [443]
3 years ago
8

Multiple choice: Sunspots appear dark because

Physics
1 answer:
zepelin [54]3 years ago
3 0

Answer: C. They are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere

Explanation:

Sunspots appear dark because they are regions in which strong magnetic fields make it difficult for fresh supplies of hot, ionized gas to reach the photosphere.

Sunspots are typically cooler than their surroundings. For example, the temperature of a large sunspot can be about 4,000 Kelvin which is lower than the temperature of the photosphere around it which is about 5,800 Kelvin.

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A bullet with a mass of 0.04-kg is traveling horizontally at 1400 m/s when it strikes a stationary target that is balanced on th
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The speed of the target with the bullet lodged in it is 5.6 m/s.

<h3>What is speed?</h3>

This is the rate of change of distance.

To calculate the speed of the target and the bullet lodged, we use the formula below.

Formula:

  • V = mu/(m+M)............. Equation 1

Where:

  • V = Speed of the target and the bullet
  • m = mass of the bullet
  • M = mass of the target
  • u = Initial speed of the target

From the question,

Given:

  • m = 0.04 kg
  • u = 1400 m/s
  • M = 9.96 kg

Substitute these values into equation 1

  • V = (0.04×1400)/(0.04+9.96)
  • V = 56/10
  • V = 5.6 m/s

Hence, the speed of the target with the bullet lodged in it is 5.6 m/s.

Learn more about speed here: brainly.com/question/6504879

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3 years ago
Is geothermal energy normally used for powering business, home, or schools today?
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A sample of water is taken and kept in a beaker in a freezer at a constant temperature of 0°C. If the system is at dynamic equilibrium, which of these statements is true?  


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An example of a double reaction is
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C. is the only double reaction here given that a double replacement reaction involves two compounds that exchange previous components, and C is the only solution with two compounds present
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Is this correct&gt; thanks
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Answer:

yes

Explanation:

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Does anyone know how to solve this? 4+9×2÷3−1
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The answer is 7.66. c:

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