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Online Homework 1 Solutions

# Online Homework 1 Solutions - 1 versus t I This graph shows...

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Unformatted text preview: 1: versus t I This graph shows the position of an I object as a Emotion of time as the I object moves liorwan'l and backward along a straight line. position in meters a] At what time other than t = I} s does the object have a velocity of seem? {Roma to two signiﬁcant digits.) b} At approximately what time is the object moving fastest in the positive dimotion? [Round to two signiﬁcant digits.) 1:} What is the approximate velocity of the object at t = l5 5? {Date digit only.) :1} What is the ﬁrst time alter t = I] s that tho-ambition oftho object is zero? (Roomi to two signiﬁeant digits.) 63) ﬁblfﬂﬂglfmm WIW 5%. 7‘“) t (5th M Win :ﬁ'rb) 5:) tau—m aha-g. ( mew WM QMI i thaw mmaJ-Jc:lcig (32a. A) it he... m com“: «to». 1M mroamaakaMtadwb-(wnﬂma ii £50105 :{ﬂw J ’l‘D ﬂ} v versus t Fm sutemehilc metres thwart! and backward on it straight highway. The ‘5 graph shows the velocity of this automobile as sﬁlnutinn of time. 3 velocity in metersfseccnd __.——-—.-———-—-—-— -1n :1- Ci J n "MK 5}] W L U ‘3.“- ..__/ a} At what time after t = t} s is theautcmehilc stepped? {Reund to twe signiﬁcant digits.) 1:} What is the acceleration of the suturichilc st tEll 4 s? (Round to two signiﬁcant digits.) c} What is the acceleration at" the autcmchite immediately alter t = I} 5? {Round to fear signiﬁcant ﬁigits.) 41} At t = 5 a, how far is the sutemchilc from its t = I] initial pesitiun? [Raced to three- .signiﬁcant digits.) 1:} What is the average veiccity cf the sutcmehile ever the ﬁrst 5 set-neitttls'iI [Round in two signiﬁcant digits.) a) 14:: quasi (uSLum was} 59:11.: EM OE s—(i‘; mice. a} {zQS Using) sash A at! a, 2 <1: ("BED—\Z—n- sL— iD—Oﬂ (“5-333 iD—G Jﬂ c.) dim C “D " ‘7” _#_r :16} a: HST—D bf. Accelerating Object Anohj'ectstmtsattim'ct=ﬂwiﬂ1:t velccity ﬂf‘i'h. = +15 mfg and mldergeee acnnetant acceleration of I Effffffifﬂ'f/tfffllfff!filliiifffiffﬁ' 13 m, 3 =- I . a] m m time duet: thc'speed efﬁ'Je-ebject reach zero? 4“” h)1-Iaw far {mm its starting {t = 011mm“ is the. object at‘ﬁmuqe L c) At what time does the object again pass through the starting {t = G) peeiticn? d) It‘the abject had initially;r been moving twice as fast {.30 Ian's]. haw far wculd it have gone before its vetecity reached zero? 6) Suppeee a second object begins moving wiﬂt a constant speed ()err = 15 mi: in the same directien from the same lccctien at the game ﬁme as the object In part [d]. At what time do the paths urn-Jase hue objects once again cross? Braking Car A ear traveijng at a speed Gf‘l". = 33 In}: stops mummy {that is? its'deeeleratiun is constant} ever It distanee of d - 172 In. a} “mat is its acceleraﬁen during the time it is stepping? {Be careful about the sign!) h} Haw lung [what amuunt .u'f time] does it take for the earth some to a step? us} After the ear has gone MB of the stopping distance, what is its speed? d}lftheearhadheengoing lﬂnﬂshuthadstoppedinﬂle sameti=1ﬂmdistanee.what would its acceleration have been? :51) ‘51—- d:: 2RD}. 0" K5201? Rags} t ,1 s "5" - (”3:3 “/0 _ ow __... - _ +4.2 Jab 0“; 2([9130 (“j—‘— 9 aw ‘3—‘ {us—Oi— +'-—? {— : HEEL n GL 0 1— ME J ; “Us. "Ll'lme'L (___.—. I G) ‘3‘“ {3+ 9‘15"” mhn ens?” _ _l' —I—-- -—I Bali Thrown From Cliff £121? A man on the edge ofa eliffﬂ #39 III high throws a hell directlyr upward. It returns past him 11 3 later. (I! actually is the height of the point of release of the hall above the has: of the oiiﬂ". Neglect air reeietanee.]_[Hlnt - Gravity causes a downward eeeeleration at the rate g = 9.31 total.) a) With what initial speed did the man throw the hell? h) Howr high above the point of release did the ball go? o) What is the wood of the ball when it passes him on the way heel: doom? :1} HOW long after the men throws it does the hall hit the gonad at the bottom ofthe olift? '1.- @ iiiuﬂ'r‘jﬁ‘he’c .L 0:0 4' “not! %cﬁif Jr 15(51.le\ to; i .. (ii-if .3 Z 1 102: 011\$ Catch the Ball A ball iethmwn straight up in the airaten initie! speed nfﬂﬂ IBIS. At the same time the ball is IhremL a person standing T0 111 1111-11111I begins to me toward the met where the ball will land. Hew fast will the We have to 11111 to catch the ball just before it hits the ground? w o:— t: +m1§a§t “5&3 3;)ch *fj: 6,125. '15? EM dawn ...
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