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Vlad1618 [11]
3 years ago
13

Scientific knowledge is both long lasting and open to change. In your own words, explain why scientific knowledge should be re-e

xamined and re-tested from time to time. Include two examples that will support your response.
Physics
1 answer:
Novay_Z [31]3 years ago
8 0
Scientific knowledge<span> is </span>both<span> durable and robust, but scientific knowledge is also </span>open<span> to </span>change. Because of the fact that it is<span> often examined and </span>re-examined by new investigations, scientific knowledge can change.N<span>ew discoveries are being made all the time.</span>
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Answer:

The correct answer is: macronutrients.

Explanation:

Nutrients are chemical substances found in food that, when consumed, allow the development, maintenance and functioning of our body.

Every time you eat a food, your body assimilates, transforms and takes advantage of its nutrients in order to live.

No single food can provide us with all the nutrients that the body needs. Only a healthy, varied and balanced diet will do it.

Types of nutrients :

Nutrients can be essential (the body cannot synthesize them on its own and we must acquire them through food) or non-essential (our body produces them from other components). According to their proportion they are divided into :

  • macronutrients: they occupy most of the food and are consumed in grams. They are carbohydrates or carbohydrates (sugar, vegetables, fruit, cereals, etc); proteins (meat, fish, eggs, milk, etc.), fats or lipids (oils, seeds, nuts, milk and derivatives).
  • micronutrients: we take them in micrograms. In this group we find vitamins and minerals. The main source is fruits and vegetables, although we also get them from most foods.

Water is another essential nutrient, without which we could not live and that helps all the physiological processes of the body to take place.

Nutrients are classified into:

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-Plastic nutrients: involved in the construction of body structures, maintenance and repair of tissues. Proteins and mineral salts belong to this group.

-Regulatory nutrients: participate in the body's regulatory processes. They are vitamins and minerals.

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Elizabeth had heart surgery to repair the pacemaker of her heart. Into which structure did the surgeon need access?
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The 400-turn primary coil of a step-down transformer is connected to an ac line that is 120 V rms. The secondary coil voltage is
KengaRu [80]

Explanation:

The given data is as follows.

             V_{1} = 120 V,    V_{2} = 6.50 V

             N_{1} = 400,     N_{2} = ?

Formula to calculate the number of turns in secondary coil are as follows.

          \frac{N_{1}}{N_{2}} = \frac{V_{1}}{V_{2}}

Putting the given values into the above formula as follows.

         \frac{N_{1}}{N_{2}} = \frac{V_{1}}{V_{2}}

        \frac{400}{N_{2}} = \frac{120}{6.50}

              N_{2} = 21.66

                          = 22 (approx)

Thus, we can conclude that number of turns in the secondary coil are 22.

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