Scientists believe that our solar system formed about 4.6 billion years ago from a cloud of hydrogen, helium, rock, ice, dust, and other material. True
False

Burgers vector is generally parallel to the dislocation line. a)-true b)-false

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 higher the astm grain size number, the finer the gran is. a)-true b)-false