Tell me why i got this question got it right and now won’t remember but i’ll get back at you when i remember
        
             
        
        
        
Answer:
The minimum value of wall thickness t=3.63 mm.
Explanation:
Given:
   D=200 mm
  P=4 MPa
 t= Wall thickness 
 maximum shear stress=27.5 MPa
We know that
        hoop stress 
       Longitudinal stress  
 
So maximum shear tress in plane
               
Now by putting the value 
        
  So   t=3.36 mm
The minimum value of wall thickness t=3.63 mm.
 
        
             
        
        
        
Answer:
(b) 7.2 mJ
Explanation:
ENERGY STORED IN CAPACITOR: the energy is stored in capacitor in electric field 
which can be calculated by expressions 
E= c
 c 
= 
 

=7200× J
 J
= 7.2× J
 J
=7.2 mJ
 
        
             
        
        
        
Answer: Isentropic process is the process in fluids which have a constant entropy. 
Explanation: The  isentropic process is considered as the ideal thermodynamical  process and has both adiabatic as well as reversible processes in internal form.This process supports no transfer of heat and  no transformation of matter .The entropy of the provided mass also remains unchanged or consistent.These processes are usually carried out on material on  the efficient device. 
 
        
             
        
        
        
Technician B is correct because torque is a force of an object.