The density of the nickel was greater than that of the quarter and penny, thus, the results supports the hypothesis.
<h3>What is density of substance?</h3>
The density of a substance is a measure of how tightly-packed the particles of the substance are.
Density is calculated as the ratio of the mass of the substance and the volume of the substance.
The hypothesis of the lab to compare the densities of a penny, a nickel, and a quarter is:
- If the nickel has a greater density than the quarter and penny, then it will have a greater mass to volume ratio. If the nickel has a lower density than the quarter and penny, then it will have a lower mass-to-volume ratio.
The average mass and the average volume of a penny, a nickel, and a quarter are then used to determine the density of each coin.
Based on obtained results, it would be found that the density of the nickel was greater than that of the quarter and penny. Therefore, the results supports the hypothesis.
In conclusion, the density of a substance depends on the mass and the volume.
Learn more about density at: brainly.com/question/1354972
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2) they add the insulation to better the durability or the earbuds
 
        
                    
             
        
        
        
Answer:
The magnitude of the electric field and direction of electric field are  and 75.36°.
 and 75.36°.
Explanation:
Given that,
First charge 
Second charge
Distance between two corners r= 50 cm
We need to calculate the electric field due to other charges at one corner
For E₁
Using formula of electric field 

Put the value into the formula 


For E₂,
Using formula of electric field 

Put the value into the formula 


We need to calculate the horizontal electric field



We need to calculate the vertical electric field



We need to calculate the net electric field

Put the value into the formula



We need to calculate the direction of electric field
Using formula of direction



Hence, The magnitude of the electric field and direction of electric field are  and 75.36°.
 and 75.36°.
 
        
             
        
        
        
Respiratory system.
Oversimplified Explanation: they enter the lungs, which is part of the respiratory system.