def k_func(h,s_H,s_K,g,n,alpha,phi,delta,k):
    """args:
    h     (float): Human capital
    s_h   (float): Investments in human capital
    s_k   (float): Investments in physical capital
    g     (float): Growth in technology
    n     (float): Growth rate of population/labour force
    delta (float): Depreciation rate
    alpha (float): Return on physical capital
    phi   (float): Return on human capital
    k     (float): Physical capital
    
    Returns: 
    The transition equation for physical capital per capita
    """
    return 1/((1+n)*(1+g))*(s_K*k**(alpha)*h**(phi)+(1-delta)*k)-k