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Electronic Card Assemblies. In a 1995 article in Quality Engineering, Ermer and Hurtis discussed applications of control charting to the monitoring of soldering defects on electronic card assemblies. One assembly technology they studied was pin-in-hole (PIH) technology, which uses wave soldering to secure components to printed circuit boards after the leads of components have been inserted through holes drilled in the boards. The most common types of soldering defects encountered using this technology are "shorts" (unwanted electrical continuity between points on an assembly) and "opens" (the absence of desired electrical continuity between points on an assembly). Production of a particular card is done in "jobs" consisting of 24 cards. All cards from a job are tested, and a count is made of the total number defects found on the job. What type of probability model might plausibly be used to describe the number of defects found on a given job? What type of control chart might you use to monitor the production of soldering defects? Suppose that records on 132 jobs show a total of 2 defects recorded. What retrospective control limits might then be applied to the 132 different counts of defects? Does a job with any defect at all signal a lack of control?
An electron is located on a pinpoint having a diameter of 2.5 um. What is the minimum uncertainty in the speed of the electron
You are standing on a sheet of ice that covers the football stadium parking lot in Buffalo; there is negligible friction between your feet and the ice. If you catch the ball, with what speed do you and the ball move afterwards
The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current
Sound is detected when a sound wave causes the tympanic membrane (the eardrum) to vibrate. How much energy is delivered to the eardrum each second when someone whispers (20.3 dB) a secret in your ear
A load of 5 kg is suspended by a string from a fixed support. A force applied on the load in a horizontal direction to displace the load through an angle of 60° from its rest position. Find value of F.
How long does it take mass to make one complete revolution.
In a discussion person A is talking 1.6 dB louder than person B, and person C is talking 3.3 dB louder than person A. What is the ratio of the sound intensity of person C to the sound intensity of person B?
you are at a furniture store and notice that a granfather clock has its time regulated by a physical pendulum that
The human eardrum has an area of 5.0×10-5 m2. What is the sound power at the threshold of pain
Determine the relative humidity (?) that results when 10.0 g of water are added to 1.00 kg of dry air at a total pressure of 10.0 MPa at 350.°C.
a molecule of dna deoxyribonucleic acid is 2.23 microm long. the ends of the molecule become singly ionized negative on
A basketball leaves a player's hands at a height of 2.20m above the floor. The basket is 3.05m above the floor. what is the range of initial speeds allowed to make the basket
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