There would be infinite acceleration,  and the body would have no mass <span />
        
             
        
        
        
The resistance of a conductor is given by

where L is the length of the wire, 

 the resistivity of the material and A the cross-sectional area.
We can see that if all the other quantities do not change, if the new length of the conductor is 4 times the original length: 

, then the new resistance is also 4 times the original value:
 
 
        
        
        
The absorption spectrum would have all the wavelengths of the light source but would have black lines where the two red and one orange lines were in the emission spectrum
        
             
        
        
        
Since the stone was dropped from height, its initial velocity = 0 m/s
Using  v² = u² + 2gs.
Where g ≈ 10 m/s²,  u = initial velocity = 0 m/s, s = height from drop = 2.5 m
v² = u² + 2gs
v² = 0² + 2*10*2.5
v² = 0 + 50
v² = 50
v = √50
v ≈ 7.07 m/s
Hence velocity just before hitting the ground is ≈ 7.07 m/s  
        
             
        
        
        
If you take a fluid (i.e. air or water) and heat it, the portion that is heated usually expands. The same mass takes up more volume and as a consequence the heated portion becomes less dense than the portion that is<span><span> not heated.</span> </span>