Answer:
The tension in the string is equal to Ct 
And the time t0 when the rension in the string is 27N is 3.6s.
Explanation:
An approach to solving this problem jnvolves looking at the whole system as one body by drawing an imaginary box around both bodies and taking summation of the forces. This gives F2 - F1 = Ct. This is only possible assuming the string is massless and does not stretch, that way transmitting the force applied across it undiminished. 
So T = Ct
When T = 27N then t = T/C = 27/7.5 = 3.6s 
 
        
             
        
        
        
The total mechanical energy of the block-spring system is given by the sum of the potential energy and the kinetic energy of the block:

where
k is the spring constant
x is the elongation/compression of the spring
m is the mass of the block
v is the speed of the block
At the point of maximum displacement of the spring, the velocity of the block is zero: v=0, so the kinetic energy is zero and the mechanical energy is just potential energy of the spring:

 (1)
where we used x=A, the amplitude (which is the maximum displacement of the spring).
Since we know 
A = 11.0 cm= 0.11 m
E = 1.10 J
We can re-arrange (1) to find the spring constant:
 
 
        
        
        
Your answer is cod!!! 
Hope this helped!!
~xox Melis
        
                    
             
        
        
        
Well, essentially there would be changes to the organisms above the food chain, depending on the extent or how much the organisms require phytoplankton as a source of product to consume, they would slightly do down in number a lot or little.
        
             
        
        
        
Sound travels in the form of a wave. Waves are characterized by three basic quantities. They are frequency, speed, and amplitude. Two of the main characteristics of sound are pitch and loudness, which in turn are determined by the frequency and amplitude of the wave, respectively.