Answer:
v_squid = - 2,286 m / s
Explanation:
This exercise can be solved using conservation of the moment, the system is made up of the squid plus the water inside, therefore the force to expel the water is an internal force and the moment is conserved.
Initial moment. Before expelling the water
           p₀ = 0
the squid is at rest
Final moment. After expelling the water
           = M V_squid + m v_water
 = M V_squid + m v_water
          p₀ = p_{f}
           0 = M V_squid + m v_water
            c_squid = -m v_water / M
The mass of the squid without water is
             M = 9 -2 = 7 kg
let's calculate
            v_squid = 2 8/7
            v_squid = - 2,286 m / s
The negative sign indicates that the squid is moving in the opposite direction of the water
 
        
             
        
        
        
When the capacitor is connected to the voltage, a charge Q is stored on its plates. Calling  the capacitance of the capacitor in air, the charge Q, the capacitance
 the capacitance of the capacitor in air, the charge Q, the capacitance  and the voltage (
 and the voltage ( ) are related by
) are related by
 (1)
 (1)
when the source is disconnected the charge Q remains on the capacitor. 
When the space between the plates is filled with mica, the capacitance of the capacitor increases by a factor 5.4 (the permittivity of the mica compared to that of the air):

this is the new capacitance. Since the charge Q on the plates remains the same, by using eq. (1) we can find the new voltage across the capacitor:

And since  , substituting into the previous equation, we find:
, substituting into the previous equation, we find:

 
        
             
        
        
        
Answer:
If children are not taught about the spread of STD's,future generations will not know how to stop them.
Explanation:
 
        
                    
             
        
        
        
Explanation:
Calculating acceleration is complicated if both speed and direction are changing or if you want to know acceleration at any given instant in time. However, it’s relatively easy to calculate average acceleration over a period of time when only speed is changing. Then acceleration is the change in velocity (represented by Δv) divided by the change in time (represented by Δt):
acceleration=ΔvΔt
 
        
                    
             
        
        
        
Answer:
The efficiency of the engine is 59.2%. 
Explanation:
We have,
Work done by the gasoline engine is 45 J and the for every 76 J of heat it takes in. 
It is required to find the efficiency of the engine. Efficiency of the engine is given by the ratio of work done to the heat taken i. Its formula is given by :

So, the efficiency of the engine is 59.2%.