Answer:
a) The net force on the ball is instantaneously equal to zero newtons at the top of the flight path. 
Explanation:
At an instantenous time at the top of the flight path, the upward force due to the Canon explosion on the ball is just equal to the weight of the ball, this will equate the net force on the ball to zero. At this point the velocity of the ball is zero before it decends down to earth under its own weight. 
 
        
             
        
        
        
Engineering requires a lot of school
        
                    
             
        
        
        
Answer:
The picture below with the answer. Hope it helps, have a great day/night and stay safe! Length of the coil,
 
        
             
        
        
        
Answer:
Super insulation are obtained by using layers of highly reflective sheets separated by glass fibers in an vacuumed space. Radiation heat transfer between any of the surfaces is inversely proportional to the number of sheets used and thus heat lost by radiation will be very low by using these highly reflective sheets which will an effective way of heat transfer.
Explanation: