Answer:
a) The speed is 61.42 m/s
b) The drag force is 10.32 N
Explanation:
a) The Reynold´s number for the model and prototype is:


Equaling both Reynold's number:

Clearing Vm:

b) The drag force is:

 
        
                    
             
        
        
        
Unit is m^3 or metres cubed. You need to multiply the three dimensions of the block to get the volume.
A ruler can be used to measure the edges.
        
             
        
        
        
Answer:
Explanation:
When saw slices wood by exerting a force on the wood , wood also exerts a reaction force on the saw in opposite direction which is equal to the force of action that is 104 N. 
So torque exerted by wood on the blade 
= force x perpendicular distance from the axis of rotation
= 104 x .128 
=13.312 Nm. 
Since this torque opposes the movement of blade , it turns the blade slower.