Consider an **Hollow** uniform Hemispherical bowl , which is placed on a rough surfaces( **each** surface has coefficient of friction $\mu$ ) .This hemispherical bowl is used for the purpose of drinking source for Birds and Crow etc. For to comfortable drinking This Bowl must be in **equilibrium** .

For equilibrium this bowl satisfy the relation :

$\sin { \theta } \quad =\quad \alpha \cfrac { \mu (\mu +\beta ) }{ { \mu }^{ \gamma }\quad +\quad \delta }$.

Then Find the value of $\alpha +\beta +\gamma +\delta$ ?

**Details And Assumptions**

$\bullet$ Take Centre of mass of Hollow hemisphere at $\cfrac { R }{ 2 }$ from base diameter. ( If needed )

$\bullet$ Assume that bowl is raised to that much angle which is maximum possible ( which means that is at the verge of slipping )