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Get Full Access to Engineering Mechanics: Statics & Dynamics - 14 Edition - Chapter 17 - Problem 17-100
Get Full Access to Engineering Mechanics: Statics & Dynamics - 14 Edition - Chapter 17 - Problem 17-100

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# . A force of F = 10 N is applied to the 10-kg ring as

ISBN: 9780133951929 123

## Solution for problem 17-100 Chapter 17

Engineering Mechanics: Statics & Dynamics | 14th Edition

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Problem 17-100

. A force of F = 10 N is applied to the 10-kg ring as shown. If slipping does not occur, determine the rings initial angular acceleration, and the acceleration of its mass center, G. Neglect the thickness of the ring

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HSES 244 Exam 1 Study Guide  Why Do We Need PE o Common causes of death (2004):  Diseases of the heart  Malignant neoplasms (cancers)  Cerebrovascular diseases (stroke)  Chronic lower respiratory diseases  Accidents (unintentional injuries) o Actual causes of death (2000):  Tobacco  Poor diet and physical activity  Alcohol consumption  Microbial agents  Toxic agents o Obesity  Obesity – an excess accumulation of fat beyond that considered “normal” for age, gender and body type  Males- 20% body fat (college age ideal: 10-15%)  Females- 30% body fat (college age ideal: 15-22%)  Over 50% of Americans are now considered obese  Related diseases cost the US economy more than \$100 billion every year  23% of all US deaths are linked to sedentary lifestyles that begin at childhood  Overweight adolescents have a 70% chance of becoming overweight adults & the problems associated o In 2003, NYC estimated that 1 in 5 kindergarten students entered their school system already clinically obese  Overweight – weight above that predicted by height/weight charts  Overfat – excess fat, usually in combination with poorly developed muscles. (to have the proper ratio of fat to weight, appropriate muscle size must be maintained) o Heart disease  Major risk factors:  Tobacco smoke  High blood cholesterol  High blood pressure  Physical inactivity  Heredity/race  Diabetes  Obesity o UnFitness boom  50% of 6-12 year old girls & 30% of 6-12 year old boys can NOT finish a mile faster than walking speed  55% of girls & 25% of boys can NOT do one pull-up  40% of young children (5-8 years old) now show at least one heart-disease risk factor o Opt out  Currently 32 states allow children to “opt out” of PE  Reasons to be exempt  High physical competency test score  Participation in community service activities  Participation in community sports activities  Participation in school activities other than sports (e.g., band or chorus)  States allowing “opt out” for health or religion: 30 o HypoKinetic Disease  Disease caused by LACK of regular physical activity  Complications:  Cardio-pulmonary  Low back pain  Psychological  Obesity o Emphasis in PE  Performance-related  Activities that contribute to skills o i.e. agility, flexibility, balance, strength, speed, form  Health-related  Activities which protect the body against disease or sickness o i.e. cardiovascular fitness, nutrition, proper joint alignment o Aerobic exercise  Exercise done at a pace/intensity where the body CAN supply enough oxygen for energy production needed to perform the exercise  Usually done for a minimum of 30 minutes  Increases cardio-vascular fitness, endurance & health o Anaerobic exercise  Exercise done at a pace/intensity where the body is UNABLE to supply enough oxygen for energy production needed to perform the exercise  Energy is supplied via anaerobic glycolysis (provides energy but creates lactic acid)  Usually short duration done at high intensity  i.e. lifting weights, sprinting, plyometrics o 5 components of physical fitness:  Cardiovascular endurance  Muscular endurance  Muscular strength  Body composition  Flexibility – a measure of the range of motion available at the joint  Determined by: o Shape of bones and cartilage at the joint o Depth of bone/socket insertion o Ligament length and point of insertion of ligament  Specific to each joint…not necessarily limited by large muscle mass  Loss of flexibility: o Lack of use o Injury o Age  Types of stretching: o Static stretch (hold 7-10 seconds) o Ballistic stretch o Partner assisted static stretch o Proprioceptive neuromuscular facilitation (PNF)  In stretch position, consciously contract muscle, then relax to further the stretch o Excuses for inactivity:  Motivation  Times  Money  Skills  Knowledge o Keys to a healthy, prolonged life:  Low Sodium  Low Fat  No Smoking  Exercise Regularly  Ch.1 – Physical Education, Exercise Science, and Sport Studies- Dynamic Fields o Physical education – a process through which an individual obtains optimal physical, mental, and social skills and fitness through physical activity o Kinesiology – the study of human movement o Exercise science – the scientific analysis of the human body in motion o Sports – physical activities governed by formal or informal rules that involve competition against an opponent or oneself and are engaged in for fun, recreation, or reward o Physical activity – repetitive movements by the skeletal muscles that require energy and produce health benefits o Physical fitness – the body’s capacity to adapt and respond favorably to physical effort o Exercise – involves physical movements that increase the rate of energy use of the body. o Play – amusements engaged in freely, for fun, and devoid of constraints. o Leisure is the freedom from work or responsibilities so that time may or may not be used for physical activity. o Recreation refreshes or renews a person’s strength and spirit after work; a diversion that occurs during leisure hours. o Athletics are organized, highly structured competitive activities in which skilled individuals participate. o Games, usually implying winners and losers, can range from simple diversions to cooperative activities to competitions with significant outcomes governed by rules. o Health-related fitness is the level of positive well-being associated with heart, muscle, and joint functions that improve healthfulness of life. o Skill-related fitness refers to achieving levels of ability to perform physical movements that are efficient and effective. o Components of Health-Related Physical Fitness:  Cardiorespiratory endurance — The ability of the lungs, heart, and blood vessels to deliver adequate amounts of oxygen to the cells to meet the demands of prolonged physical activity  Muscular strength — The ability to exert maximum force against resistance  Muscular endurance — The ability of muscles to exert sub- maximal force repeatedly over a period of time  Flexibility — The ability of a joint to move freely through its full range of motion  Body composition — Percent body fat or lean body mass o Components of Skill-Related Physical Fitness:  Agility — ability to change directions rapidly and accurately  Balance — ability to maintain equilibrium while stationary or moving  Coordination — ability to perform motor tasks smoothly and accurately  Power — ability to exert force rapidly through a combination of strength and speed  Reaction time — ability to respond or react quickly to a stimulus  Speed — ability to quickly perform a movement o FITT Principles  Frequency — how often a person should train  Intensity — how hard a person should exercise  Time — how long or the duration a person should exercise  Type — kind or mode of exercise performed  Ch.2  Ch.3  Ch.4  Ch.5  Ch.6

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