A vertical circular disc is supported by a horizontal stepped shaft as shown in Figure $5.$ Determine equivalent length of shaft $($m$)$ when equivalent diameter is $20$ mm $.$

a$.0\mathrm{.}56$

b$.0\mathrm{.}18$

c$.0\mathrm{.}91$

d$.0\mathrm{.}24$

e$.$ None of the above

SECTION B

Find the natural frequency and the response of the system shown in Figure $6.$

$]\}$

$\{[1]\}$

$\{[0$

The schematic diagram of a marine engine connected to a propeller through gears is shown in Figure $7.$ The mass moment of inertia of the flywheel and propeller are $15000$