If my friend have the corona what do I do

(A. Wash my hands

(B. Run away

(C. Hug them

(D. Kill them

(E. Call the hospital to take them away

Shafts are machine elements that are used to a) carry axial loads b) direct shear loads c) transmit power d) rotate at constant speed e) none of the above circular and square shafts subjected to the same torque under the same circum behave a) the same way b) almost the same way

The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?

The sum of the normal stresses does not change as the stress state rotates through an angle. a)-trune b)- false