Gravitational force
Weak nuclear force
Electromagnetic force
Strong nuclear force
Answer:
The ratio of atoms of potassium to atoms of oxygen is 2:1
Explanation:
As the equation given is :
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![4K + O_2 -----> 2K_2O](https://tex.z-dn.net/?f=4K%20%2B%20O_2%20%20-----%3E%20%202K_2O)
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The product formed is 2 moles of potassium oxide .
Amount of potassium atom in the potassium oxide is 2 atoms of potassium and amount of oxygen atom present here is 1 atom of oxygen .
But we have 2 moles of potassium oxide . So, the potassium and oxygen atoms will be multiplied by 2 .
Hence , we get 4 atoms of potassium and 2 atoms of oxygen .
Ratio of potassium to oxygen atoms is - 4:2
Therefore , 2:1
Answer:
The total water content in the earth remains nearly constant.
Explanation:
- The amount of water on earth is nearly same as the amount of water that was on earth in Mesozoic era.
- Plants and animals use water as a raw material in their growth, but that water is eventually returned to earth.
- When the UV light breaks the water molecules in higher atmosphere, some water is lost.But it is compensated by the water that enters the earth through meteors and comets.
- The water content is not constant but through the series of biochemical reactions,the water level is nearly the same.
Answer:
Percent error = 41%
Explanation:
Percent error:
Percent error is the difference between the measured value and actual value divided by actual value multiply by 100.
Given data:
Actual length of rope = 3.15 m
Measured length of rope = 1.85 m
Percent error = ?
Solution:
Formula:
Percent error = [measured value - actual value / actual value ] × 100
Now we will put the values in formula.
Percent error = [1.85 - 3.15 / 3.15 ] × 100
Percent error = [-1.3 /3.15 ] × 100
Percent error = -0.41 × 100
Percent error = 41%
The negative sign shows that measured value is less than the actual value but often results are reported in absolute value.