If the surface between them is the same, then the largest force exerts the body with the largest mass, ie 8 kg
 
        
             
        
        
        
Answer:
Gases
Explanation:
The molecules in a gas are spaced very far apart. 
 
        
                    
             
        
        
        
Answer:
Explanation:
In wheel and axle. …with the system is the velocity ratio, or the ratio of the velocity (VF) with which the operator pulls the rope at F to the velocity at which the weight W is raised (VW). This ratio is equal to twice the radius of the large drum divided by the difference…
 
        
             
        
        
        
Answer:
18.6012339739 A
Explanation:
 = Vacuum permeability =
 = Vacuum permeability = 
L = Length of wire = 55 cm
N = Number of turns = 4000
I = Current
Magnetic field is given by

The current necessary to produce this field is 18.6012339739 A
 
        
             
        
        
        
Answer:6.298,4.1,1.9015 
Explanation:
Wavelength=
= =4.397 m
=4.397 m
Distance of 3rd speaker from speaker A is x 
From B 78-x
Difference between the distances must be a whole number of wavelengths
First 
 for 1 st wavelength
    for 1 st wavelength
2x=8.2+4.397=12.597
x=6.298m
second
 For zero wavelength

2x=8.2
x=4.1m
Third

x=1.9015 m