import math


def g2d2(h, tw, E, Fy):
    """Web shear coefficient, Case (a)
    
    For webs of rolled I-shaped member with
    
    if h/tw <= 2.24*math.sqrt(E,Fy):
        Cv = 1.0
    else:
        Cv = None
    
    Args:
        h (float): 
            web height
        
        tw (float):
            web thickness
            
        E (float):
            modulus of elasticity
        
        Fy (float):
            yield strength of web
            
    Returns:
        Cv (tuple(float, str)):
            web shear coefficient
            
    """
    
    if h/tw <= 2.24*math.sqrt(E/Fy):
        Cv = 1.0
        text = ()
    else:
        Cv = None
        text = ()
        
    return Cv, text