Answer:
The speed decreases.
Explanation:
This can be explained using the conservation of linear momentum.
Since there is no friction, the initial moment of the train must be equal to its linear moment after it is filled with water.
the initial linear momentum is

where  is the initial mass of the train, and
 is the initial mass of the train, and  the initial speed of the train.
 the initial speed of the train.
And linear momentum after the water filled the train car is

where  is mass of the train after the  rain, and
 is mass of the train after the  rain, and  the speed of the train after the rain
 the speed of the train after the rain
<u>the equality must be fulfilled:</u>

We know that if water is added to the train,  that is the mass after the water is added, is greater than
 that is the mass after the water is added, is greater than  which is the mass of the train without the water.
 which is the mass of the train without the water.
Therefore, in order for the conservation of the linear momentum to be fulfilled: 
the speed after the water is added ( ) must be smaller than the initial train speed (
 ) must be smaller than the initial train speed ( ) . So the speed of the car decreases.
 ) . So the speed of the car decreases.
 
        
             
        
        
        
To solve this problem it is necessary to apply the concepts related to mutual inductance in a solenoid.
This definition is described in the following equation as,

Where,
 permeability of free space
permeability of free space
 Number of turns in solenoid 1
 Number of turns in solenoid 1
 Number of turns in solenoid 2
 Number of turns in solenoid 2
 Cross sectional area of solenoid
 Cross sectional area of solenoid 
l = Length of the solenoid 
Part A ) 
Our values are given as,





Substituting,



PART B) Considering that many of the variables remain unchanged in the second solenoid, such as the increase in the radius or magnetic field, we can conclude that mutual inducantia will appear the same.
 
        
             
        
        
        
Answer:
As the vibrations of the particles reach your ear, your ear drum receives the vibrations which the brain then interprets as sound. In the vacuum of space, there are no (or very, very few) particles to vibrate, so sound cannot travel through this medium.
Explanation:
 
        
             
        
        
        
Nuclear energy <em>is t</em><span><em>he energy released during nuclear fission or fusion.
</em></span>
        
                    
             
        
        
        
F=ma
F= 4x1.2
F= 4.8 N
F= 4gsin30 - Friction
Friction= 19.6 - 4.8 N
Friction= 14.8 N
Friction= u x 4gcos30
14.8 / 4gcos30 = u
u= 0.43596...
u= 0.44
coefficient is 0.44