Answer:
First answer to the first question is Two people pulling a rope with the same force in a opposite direction.  The other one would be 2.72N        
Explanation:
Hope this helps you :)
 
        
             
        
        
        
Answer:

Explanation:
From the question we are told that:
Length 
Mass 
Distance from Tip 
Generally, the equation for Torque Balance is mathematically given by


Therefore

 
        
             
        
        
        
Answer:
Simple awnser Do it yourself I really would help but I have no clue! Sorry
Explanation:
 
        
             
        
        
        
Answer:
the rocks have the same amount of thermal energy 
 
        
                    
             
        
        
        
1. Developing renewable energy technology
- Efficient energy storage and smarter grids .
- renewable and rechargeable batteries and fuel cell
2. Saving endangered wildlife
-smart collars for endangered species and reducing human - animal conflict 
-Gene sequencing for detecting and researching on deadly animal diseases.
3. Adopting a smarter lifestyle
- smart homes that promote energy saving and green - living .
- electric cars which are three times more conventional vehicles . 
Hope this helps :)