A satellite in a circular low Earth orbit has an orbital speed of $7.60 \text{ km/s}$ at an orbital radius of $6800 \text{ km}$. Find its centripetal acceleration in units of Earth-radii per day squared ($R_E/\text{day}^2$). (Take $R_E \approx 6371 \text{ km}$ and $1 \text{ day} = 86,400 \text{ s}$)