The disk, which has a mass of 20 kg, is subjected to the couple moment of M = (2u + 4) N # m, where u is in radians. If it starts from rest, determine its angular velocity when it has made two revolutions.
Normative Changes ● Weight loss (brain cell loss) ● Deeper sulci, flattened gyri, enlarged ventricles ● Loss of myelin on axon ● Reduction in neurotransmitters/neuroreceptors ● Accumulation of tangles and plaques Intelligence ● Fluid intelligence: the capacity to process novel information Includes reasoning, spatial orientation, perceptual speed, verbal memory, numeric/verbal ability. Generally NOT related to experience or learning. ● Crystallized intelligence: information, skills, and strategies that people learn through experience. Mostly vocabulary and knowledge (facts..) VERY related to experience and learning Learning ● The process of acquiring knowledge and skills ● Learning declines with age (because..) Neuron loss and.. Short term memory Reduced plasticity Processing speed ****Measure learning: digit symbol substitution test Memory ● The retention (storage) of information Shortterm ● Benign senescent forgetfulness ● Compensations Longterm ● Slower retrieval speed ● False/inaccurate memories E.g., source memorymisattribution, confabulation Pathological Changes ● Dementias Pathological decline in cognitive/mental function to a degree that interferes with daily living Mostly caused by unusual changes at the neuron level chemical and/or physical Can result in impaired memory, intellect, judgement, and orientation, cognitive functioning, personality shifts, etc., and may cause frustration, agitation, anxiety, depression, delusions. Types of Dementias ● Cellular degeneration dementalzheimer’s, Frontotemporal [Picks], Lewy Body, Parkinson’s ● Vascular dementia troke ● Infectionrelated dementhigh fevers, AIDS, Syphil) ● Drugrelated dementiantipsychotics, antidepressants, painanxiety m s) ***reversible Depression ● Depressed mood ● Loss of interest in things you once enjoyed ● Change in appetite ● Sleep disturbance ● Fatigue ● Feeling worthless and guilty ● Problems thinking/concentrating ● Psychomotor disturbances (restless, or decreased activity) ● Suicidal thoughts for at least 2 weeks