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Was titanic sank because of charpy v-notch test was not done?
It is unlikely that an impact test of the metals used in the Titanic was responsible for it's sinking. Had the test been done and it's impact resistance been proved, the problems of designing a liner which could travel at 20 knots into a solid lump of ice with a mass of millions of tonnes would be impracticable. The most obvious cause of the sinking rests with the water tight compartments which were not sealed at the top allowing water from the puncture in the skin to flow over into the next water tight enclosure slowly dragging the vessel under.
What is a clock maker called?
A person who works on both clocks and watches or watches alone (for some reason) is called a Horologist. But I have been told by a French man who has four generations of watch/clockmakers in his family that a clockmaker that only works on clocks is called a Pendulier (can't find the correct spelling)
What are ferrules used for in plumbing?
A ferrule is used on a compression type joint. Care should be taken to properly tighten the nut, but typically it goes between the nut and a fitting. You should use plastic ferrules on plastic pipe but also be sure to use a brass or stainless sleeve inside the open end of the pipe so you don't crush it and it maintains therigidity of the pipe. You should use a brass ferrule on copper pipe which are stronger and give a better squeeze on the pipe sealing the joint. Usually hand tight plus a 1/2 turn is good to start with. water test the fitting and if it leaks you can always shut it back off and tighten more. One rule of plumbing is tight is tight, too tight is broke! There is no need to apply pipe sealant, pipe dope, or Teflon tape to the threads of the compression nut. None of these things will hurt, but they won't help either, since the seal depends ONLY on how well the ferrule is compressed against the pipe and the taper of the fitting. If the fitting leaks, it is because something is wrong. You could have over- or under-tightened the nut, the ferrule might have been damaged, the taper might have a nick in it, etc.
How do you construct a rubber band powered plane?
A rubber band is attached to any fixed surface of the car and then the other end is attached to the rear axle of the car. You wind the car up by turning the back tires but be sure and keep the tires from free spinning until you are ready for the car to go. When you let it go, the rubber band that has been stretched will unwind from the axle and force the cars tires to turn thus pushing the car forward.
Where iterative model is used?
Iterative model is used when tight market deadlines make completion of a comprehensive software product impossible, but a limited version must be introduced in order to meet competitive or business pressure; a set of core product or system requirements are well understood, but the details of product or system extensions have yet to be defined. In these and above situations, a process model is required that has been explicitly designed to accommodate a product that evolves over time. Iterative model provides the best help in such situation.
