Answer: Gasoline cars are bad because
Explanation: They give off carbon emissions and pollute the ozone layer causing the greenhouse effect which leads to global warming
Answer:
a)True
Explanation:
Yes it is true that principle stresses are the function of σx,σy and τxy.
We know that principle stresses σ1,σ2 given as follows
Where σx ,σy are the normal stresses and τxy is shear stress.
σ1 is the maximum principle stress and σ2 is the minimum principle stress.
Answer:
zero off your workpiece so you can work from a datum, usually the centre of your work on a lathe. change your tool to a drill and drill a hole to a size smaller than your thread diameter, change out your tool for a threaded tap and away you go.
I'm not sure which part they want but I'd say ensure your tool is set to the right height, you have the tool lines up where you want to cut and that you have calculated the speed you need to cut at safety. Drill a hole before you tap though.
If you have a CNC lathe you just set the programme to do the processes and tool change for you.