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Get Full Access to Engineering Mechanics: Statics - 14 Edition - Chapter 4 - Problem 4-12
Get Full Access to Engineering Mechanics: Statics - 14 Edition - Chapter 4 - Problem 4-12

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# Solution: The towline exerts a force of P = 6 kN at the end

ISBN: 9780133918922 126

## Solution for problem 4-12 Chapter 4

Engineering Mechanics: Statics | 14th Edition

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Engineering Mechanics: Statics | 14th Edition

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Problem 4-12

The towline exerts a force of P = 6 kN at the end of the 8-m-long crane boom. If x = 10 m, determine the position u of the boom so that this force creates a maximum moment about point O. What is this moment? 1 m O 8 m A B P 6 kN u x Probs. 411/12

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Module #18-­‐ Basic concepts of sensation and perception Sunday, February 28, 2016 5:55 PM -­ Heather Sellersc 'urious mix of "perfect vision" and face blindness: the distinction between sensation and perception ○ Sensation: the process by which our sensory receptors and nervous system receive and represent stimulus energies from our environment (sensory receptors detect information→nervous system transmits the information to her brain) [normal] ○ Perception: the process of organizing and interpreting sensory information, enabling us to recognize meaningful objects and events [almost normal] ○ Bottom -­‐up processing: analysis that begins with the sensory receptors and works up to the brain's integration of sensory information [build up from smallest pieces of sensory info/detect lines, angels, colors…] ○ Top-­‐down processing: constructs perceptions from the sensory input by drawing on our experience and expectations [perception that's driven by perception/ the brain applies what you know/expected -­‐-­‐ perception by content/your brain add meanings] -­ Transduction: the process of converting one form of energy into another that our brain can use § Eg. In sensation, the transforming of stimulus energies (sights, sounds, smells…) into neural impulses our brain can interpret ○ Three basic steps to all our sensory systems § Receive sensory stimulation (specialized receptor cells) § Transform that stimulation into neural impulses § Deliver the neural information to our brain ○ Psychophysics: studies the relationships between the physical energy we can detect and its effects on our psychological experiences -­ Thresholds ○ Absolute thresholds: the minimum stimulus energy needed to detect a particular stimulus (eg. Light, sound, pressure, taste…) 50% of the time [the point where sth. Becomes noticeable to our sense-­‐s-­‐-­‐anything less than this goes unnoticed] ○ For weak stimulus (or signal, such as hearing-­‐test tone): signal detection theory § A theory predicting how and when we detect the presence of a faint stimulus (signal) amid background stimulation (noise) [no single absolute threshold and the detection depends partly on a person's experience, expectations, motivation, and alertness]/[why people respond differently to the same stimuli, and why the same person's reactions vary as circumstances change] ○ Subliminal: stimuli you cannot detect 50 percent of the time for conscious awareness (below your absolute threshold) ○ Priming: the activation, often unconsciously, of certain associations, thus predisposing one's perception, memory, or response § Much of our information processing occurs automatically, out of sight, off the radar screen of our conscious mind. ○ Difference thresholds (just noticeable difference: jnd): the minimum difference a person can detect between any two stimuli half the time [the stimulus becomes detectable to us, how do we recognize if the stimulus changes] § It can increase with the size of the stimulus § Weber's law (Ernst Weber): the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage(rather than a constant screen of our conscious mind. ○ Difference thresholds (just noticeable difference: jnd): the minimum difference a person can detect between any two stimuli half the time [the stimulus becomes detectable to us, how do we recognize if the stimulus changes] § It can increase with the size of the stimulus § Weber's law (Ernst Weber): the principle that, to be perceived as different, two stimuli must differ by a constant minimum percentage(rather than a constant amount) □ Ex. Lights: 8%, weights: 2%, tones: 0.3% -­ Subliminal Persuasion ○ Acknowledge/ influence people in certain way (powerful) -­ Sensory adaptation: diminished sensitivity as a consequence of constant stimulation ○ Benefit: freedom to focus on informative changes in our environment without being distracted by background chatter ○ We perceived the world not exactly as it is, but as it is useful for us to perceived it. ○ It allows us to focus on changing stimuli -­ Perceptual Set: a mental predisposition to perceive one thing and not another, affects (top-­‐down) what we hear, taste, feel and see ○ What determine our perceptual set -­‐the preexisting schemas (influence how we apply top-­‐down processing to interpret ambiguous sensations) -­ Context Effects ○ The context creates an expectation that, top down, influences our perception -­ Motivation and Emotion ○ Influence perceptions (top-­‐down) and color our social perceptions ○ Perceptual bias

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##### ISBN: 9780133918922

The full step-by-step solution to problem: 4-12 from chapter: 4 was answered by , our top Engineering and Tech solution expert on 11/10/17, 05:25PM. Since the solution to 4-12 from 4 chapter was answered, more than 416 students have viewed the full step-by-step answer. This textbook survival guide was created for the textbook: Engineering Mechanics: Statics, edition: 14. The answer to “The towline exerts a force of P = 6 kN at the end of the 8-m-long crane boom. If x = 10 m, determine the position u of the boom so that this force creates a maximum moment about point O. What is this moment? 1 m O 8 m A B P 6 kN u x Probs. 411/12” is broken down into a number of easy to follow steps, and 59 words. This full solution covers the following key subjects: Boom, moment, Force, long, end. This expansive textbook survival guide covers 11 chapters, and 1136 solutions. Engineering Mechanics: Statics was written by and is associated to the ISBN: 9780133918922.

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