Answer:
thank you for the free point have a great rest of your day 
 
        
             
        
        
        
Answer:
a)
The crack and connecting rod is used in the design of car.This mechanism is known as slider -crank mechanism.
Components:
 1.Inlet tube
2. Wheel 
3. Exhaust
4. Engine
5.Air tank 
6.Pressure gauge
7.Stand
8. Gate valve
b)
The efficiency of air engine is less as compare to efficiency of electric engine and this is not ecofriendly because it produce green house gases.These gases affect the environment.
c)
it can run around 722 km when it is full charge.
                                                                                                                                                      
 
        
             
        
        
        
Answer:
The average adult brain is about 15 cm and weighs from 1300 to 1400 grams. So around 3 pounds
So not yet, im not an adult yet
 
        
                    
             
        
        
        
Answer:
Complete answer to the question is explained in the attached files.please have a look on it.
Explanation:
 
        
             
        
        
        
analyzing building materials???????????? but i can try i think it is analyzing the materials of the building