A uniform cylinder of radius a originally has a weight of 80 \mathrm{~N}. After an off-axis cylinder hole at 2 a / 5 was drilled through it, it weighs 65 \mathrm{~N}. The axes of the two cylinders are parallel and their centers are at the same height. A force T is applied to the top of the cylinder horizontally. In order to keep the cylinder is at rest, the magnitude of the force is closest to:
Answer Choices
A. 6 \mathrm{~N}
B. 10 \mathrm{~N}
C. 15 \mathrm{~N}
D. 30 \mathrm{~N}
E. 38 \mathrm{~N}
