Bird bones have air pockets in them to reduce their weightthis also gives them an average density significantly less than that of the bones of other animals. Suppose an ornithologist weighs a bird bone in air and in water and finds its mass is 45.0 g and its apparent mass when submerged is 3.60 g (the bone is watertight). (a) What mass of water is displaced? (b) What is the volume of the bone? (c) What is its average density?
PSYC 1000 Week 13 Notes April 1115 Depression Biological factors Genetic predisposition Tends to run in families Lack of serotonin, norepinephrine, dopamine Release more stress hormones than others Psychological and social factors Neuroticism Learned helplessness, external locus of control Perfectionism Negative explanatory style Lack selfserving bias Stress Bipolar disorder: experiencing extreme moods out of proportion to events of life Manic depression Mania: highly agitated emotional state Emotion: euphoria or irritability Cognition: optimism, poor judgment, grandiosity Behavior: hyperactivity, insomnia, talkativeness, recklessness Genetic predisposition, stress Schizophrenia Characteristics Disordered and irrational thoughts and ideas Distorted perceptions, psychosis Inappropriate emotions and behaviors Major symptoms Hallucinations, usually auditory Delusions: thoughts and beliefs inconsistent with reality Persecution: belief that other people are out to get them Grandeur: exaggerated belief in their own importance Ideas of reference: believe that random events have personal relevance Di