Two people are carrying a uniform wooden board that is 3.00 m long and weighs 160 N. If one person applies an upward force equal to 60 N at one end, at what point does the other person lift? Begin with a free-body diagram of the board.
Chapter 12: Adulthood Body and Mind I. Adulthood a. 25-65 years old b. Peak health→senescence c. work→retirement d. novice→expert e. raising children→grandchildren II. Senescence a. Gradual physical decline related to aging b. Begins when growth stops c. Occurs to every person, in every body part, but at variable rates d. Based on genetics III. Allostatic Load a. “wear and tear” on body b. Accumulation f physical and mental stress c. Metabolism slows d. Weight changes e. Lung capacity decreases f. Increase in cholesterol and blood pressure IV. Aging a. Genetic senescence and allostatic load impact how we age b. Three aspects protect adults from noticing senescence – organ reserve, homeostasis, allostasis V. Environmental Factors a. Exercise Protects against every major illness 150 minutes per week of moderate exercise or 25 minutes per week of intense exercise Reduces blood pressure; strengthens heart and lungs; reduces depression, osteoporosis, heart disease, arthritis, and some cancers b. Drug Use Prescription drugs when used correctly reduce illness, disability, and death rate Used inappropriately makes user unable to recognize addiction Over-the-counter Vitamins, analgesics, antihistamines, laxatives,
