Answer:
It says energy can't be created or destroyed
Explanation:
 
        
             
        
        
        
Answer:
A
Explanation:
because u are subtracting if this is from flvs that is what i did and it was right 
 
        
                    
             
        
        
        
Answer:
 = 1.75 × 10⁻⁴ m/s
 = 1.75 × 10⁻⁴ m/s
Explanation:
Given:
Density of copper, ρ = 8.93 g/cm³
mass, M = 63.5 g/mol
Radius of wire = 0.625 mm
Current, I = 3A
Area of the wire,  =
 =  
 
Now,
The current density, J is given as
 = 2444619.925 A/mm²
= 2444619.925 A/mm²
now, the electron density, 
where, 
 =Avogadro's Number
=Avogadro's Number

Now, 
the drift velocity, 

where,
e = charge on electron = 1.6 × 10⁻¹⁹ C
thus,
 = 1.75 × 10⁻⁴ m/s
 = 1.75 × 10⁻⁴ m/s
 
        
                    
             
        
        
        
An energy crisis<span> is any significant (bottleneck; logistics; or price rise) in the supply of energy resources to an economy. In popular literature, it often refers to one of the energy sources used at a certain time and place, in particular those that supply national electricity grids or those used as fuel in vehicles.</span>
        
             
        
        
        
Answer:
frequency
Explanation:
The phenomenon of apparent change in frequency due to the relation motion between the source and the observer is called Doppler's effect. 
So, when we move farther, the frequency of sound decreases. The formula of the Doppler's effect is  

where, v is the velocity of sound, vs is the velocity of source and vo is the velocity of observer, f is the true frequency. f' is the apparent frequency.