A Cylindrical Space Colony 8

Multiple Choice

A cylindrical space colony 8.00 km in diameter and 30.0 km long has been proposed as living quarters for future space explorers.Such a habitat would have cities,land,and lakes on the inside surface and air and clouds in the center.All this would be held in place by the rotation of the cylinder about the long axis.How fast would such a cylinder have to rotate to produce a 1-g gravitational field at the walls of the cylinder?

A) 0.049 rad/s
B) 0.035 rad/s
C) 0.0025 rad/s
D) 0.15 rad/s