In a block and tackle, some friction in the pulleys will reduce the mechanical advantage of the machine. To include friction in a calculation of the mechanical advantage of a block and tackle, divide the weight of the object being lifted by the weight necessary to lift it. 
Hope this helps
        
                    
             
        
        
        
The answer is true, is called Thermal pollotion:).
 
        
             
        
        
        
Answer:
false, because a phase change occurs physical changes when matter changes its energy state.
 
        
                    
             
        
        
        
Answer:
2.89 hours
Explanation:
given :
Vo = 72 km/h 
Vt = 90 km/h 
S = 234 km 
find : the time taken (t) = ?
solution :
2.a.s = Vt² - Vo²
2.a.(234) = 90²- 72²
468.a = 8100 - 5184
 = 2916
a = 2916/468 = 6.23 km/h²
so, 
t = (Vt-Vo) /a
 = (90-72)/ 6.23
 = 18/ 6.23
 = 2.89 hours