Hello I am going to do another riddle. Get it wrong and I report you. Get it right and you get 5 satrs and 10 points The answer for What can you catch, but not throw?

Modern high speed trains do not have perpendicular expansion gaps where rails are joined end-to-end any more they are mostly welded together but what might happen if there was a spell of particularly hot weather that causes inspection of the tracks?

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

What is the chief metrological difference between measuring with a microscope and with an electronic comparator? a. the microscope is limited to small workpieces. a. the microscope is limited to small workpieces. c. the comparator can only examine one point on the workpiece. d. the microscope carries its own standard.