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HW 13

# HW 13 - 12.24 An athlete at the gym holds a 3.0 kg steel...

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12.24] An athlete at the gym holds a 3.0 kg steel ball in his hand. His ann is 70 em long and has a mass of 4.0 kg. What is the magnitude of the torque.about his shoulder ifhe holds his arm straight out to his side, parallel to the floor? What is the magnitude of the torque about his shoulder if he holds his arm straight, but 45° below horizontal? t.'0t>ll.J Y)S '"'r.'" a 1 "") . Y'~ c-I,J, ~ ~ ~ ~ ' 'P\ )<)t.!I ~tj \(0 ) '"')\.1 ~ ~ )(~ ~ F~~ ')"1.1:> <¥,\V)~~'+ ~ . y ~"-1 "j~' ~Y\ 1-\ ~ ~ lLo 'X Cj' 'i .of)/.s 1 X. C' ~ W) ~ \ + '-\ 'K') "f.. c:> ' ~ .¥) Is 1 "/.. t)' ~ ~ )'V) :. ':>'1.)N 1 ~ \-Ct\~ 'Y ~ f...~'" '-\ 'i' -+ r CoVIY \1\ '¥\'v\ '--\S' " ::: ') 't '0 r. Cj .'6 ,V) J ~1. '" (:),t Y) ..,., -L + \.\ K1 " c)' ~ h1 /j L V'2. . - -

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l I The wrench in the figure has six forces of equal magnitude acting on it. Rank these forces (A through F) on the basis of the magnitude of the torque they apply to the wrench, measured about an axis centered on the bolt.Rank from largestto smallest. To rank items as equivalent, overlap them. I) D 2-) rolE ~) F ~) (.\ <;) L l - . y l\J"1 }'?-I)~ ) l - . too~ hl\V~ €-'i~ "f ) ( -: e \~ 10-1..)'-\..h f +(,.,~ A 12.22] The 20-cm-diameter disk in the figure can rotate on an axle through its center. What is the net torque about
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