In order for a hypothesis to be tested, and experiment needs to be designed.
Many trials need to be runned in order to get accurate results and to form a valid conclusion that can prove or disprove the hypothesis
 
        
             
        
        
        
Answer:
A.  It is zero.
Explanation:
D Later in the day, more power is developed in lifting each box. 12 A manometer is used to indicate the pressure in a steel vessel, as shown in the diagram. What value does the liquid manometer give for the pressure in the vessel? It is zero
 
        
             
        
        
        
Answer:
f = 8 %
Explanation:
given,
density of body of fish = 1080 kg/m³
density of air = 1.2 Kg/m³
density of water = 1000 kg/m²
to protect the fish from sinking volume should increased by the factor f
density of fish + density of water x increase factor = volume changes in water                                                    
1080 +f x 1.2 =(1 + f ) x 1000                
1080 + f x 1.2 = 1000 + 1000 f      
998.8 f = 80                                   
f = 0.0800                             
f = 8 %                                         
the volume increase factor of fish will be equal to f = 8 %
 
        
             
        
        
        
Answer:
true
Explanation:
this is the answer to this question