# Bar.py

from numpy import pi

class Bar():
    def __init__(self, radius:float=0.1, k:float=0.5, h:float=0.0025, E:float=7e9, density:float=2710):
        self.radius:float = radius
        self.k:float = k
        self.h:float = h
        self.E:float = E
        self.density:float = density

        self.update_properties()
    
    def update_properties(self):
        self.area:float = pi*self.radius**2
        self.p: float = 2*pi*self.radius
        self.alpha = ((self.h*self.p)/(self.k*self.area))**0.5