Answer:
Explanation:
The standard equation of the sinusoidal wave in one dimension is given by 

Here, A be the amplitude of the wave
λ be the wavelength of the wave
v be the velocity of the wave
Φ be the phase angle 
x be the position of the wave 
t be the time 
this wave is travelling along positive direction of X axis 
The frequency of wave is f which relates with velocity and wavelength as given below
v = f x λ
The relation between the time period and the frequency is 
f = 1 / T. 
 
        
             
        
        
        
Water as it's the highest specific heat capacity
Hope this helps x
        
                    
             
        
        
        
Replaces spring 2. the mass of the weight and pulley are unchanged: m=5.8 kg and mp=1.7 kg
        
             
        
        
        
The molecules of a solid vibrate faster so that they start spreading out to become a liquid. This energy makes them vibrate faster so the bonds between molecules can't interact all that well anymore creating more distance. The stronger the bonds between the molecules the higher the energy (temperature) has to be to get them away from each other. Hope I didn't confuse you too much!
        
             
        
        
        
Answer:
Part 1) Time of travel equals 61 seconds
Part 2) Maximum speed equals 39.66 m/s.
Explanation:
The final speed of the train when it completes half of it's journey is given by third equation of kinematics as

where
'v' is the final speed
'u' is initial speed 
'a' is acceleration of the body
's' is the distance covered 
Applying the given values we get

 Now the time taken to attain the above velocity can be calculated by the first equation of kinematics as 

Since the deceleration is same as acceleration hence the time to stop in the same distance shall be equal to the time taken to accelerate the first half of distance
Thus total time of journey equals
Part b) 
the maximum speed is reached at the point when the train ends it's acceleration thus the maximum speed reached by the train equals 