$1.$ In a certain device, the disk rotates at $5000$rpm$.$ a$)$ how long does one revolution take? b$)$ what is the average rotational delay of this disk drive $2.$ Consider a disk dirve with $1000$ tracks, numbered $0$ to $999.$ The request queue has the following composition: $300740150940200850145555775695.$ The current position is $197$ and the previous request was served at $100.$ For each of the following disk scheduling algorithsm, compute the total distance $($in tracks$)$ that the disk arm would move. Include the calculation steps in your answers. $2\mathrm{.}1$ First$-$In$-$First$-$Out $($FIFO$)2\mathrm{.}2$ Shortest$-$Service$-$Time$-$First $($SSTF$)2\mathrm{.}3$ SCAN $($no LOOK variation$)2\mathrm{.}4$ C$-$SCAN $($No C$-$LOOK variation$)$