Answer:
C. Burning coal tends to harm the environment more than using solar panels.
Explanation: 
When coal is burned, it reacts with the oxygen in the air. This reaction converts the stored potential energy, which turns into thermal energy, which is released as heat. But it also produces methane and carbon dioxide which is released into the air.
 
        
             
        
        
        
Answer:
<h2>Refer the attachment for answer and explanation please</h2>
Explanation:
This might surely help you ☺️❤️
 
        
             
        
        
        
Answer: They will repel each other.
Explanation:
Two inflated balloons when rubbed with woolen cloth will lead to repeal each other because of the similar charges on both the balloons.
Rubbing both the balloons together by the woolen cloth will introduce negative charge in the balloons.
As, we know that the same charges repeal each other both of the balloons with be apart from each other.
This is due to the static electricity, the negatively charged particles jump to the positive one. When balloons are rubbed they become negatively charged.
 
        
                    
             
        
        
        
Speed = frequency * wavelength
        
             
        
        
        
 1.46m/s²
Explanation:
Given parameters: 
Mass of cart = 281kg 
Net external force = 411N 
Unknown: 
Acceleration of the cart = ? 
Solution: 
According to newton's second law " the net force on a car is the product of its mass and acceleration";
             Force = mass x acceleration
Since acceleration of the cart is unknown; 
      Acceleration =  =
 = 
   Acceleration = 1.46m/s²
learn more: 
Newton's laws brainly.com/question/11411375
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