An offshore drilling rig is being towed out to sea. what is the maximum distance away that the navigation lights can still be seen by an observer standing on the shoreline? the observer's eye height is 5'6", and the uppermost navigation light is 168 ft above the water.

Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.