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Name: _ Answers_ _______ P2601 (Spring 2010) Individual Exam 1 Time flies like an arrow; fruit flies like a banana. --Groucho Marx Possibly Useful Formulas: 1 in=2.54 cm, 1kg~2.2 lb; 222 2c o s cab a bC  ; sin sin sin abc A BC  ; hyp 2 =opp 2 +adj 2 ; SOHCAHTOA; circle area= r 2 , circumf=2 r; sphere vol=4/3 r 3 , area=4 r 2 ; If ax 2 +bx+=0 , then 2 4 2 bba c x a  ; i ttt   ; f i x x v t ; f i vv a t ; x=x i + v t; v=v i + a t ; 0 lim inst t v a t  ; 0 lim inst t x v t For constant a: 2 i f v v v ; x x i =v i t+ 1 2 at 2 ; x x i =v f t 1 2 at 2 v x 2 =v xi 2 +2a x (x-x i ); 2sin cos =sin2 ; sin 2 +cos 2 =1 ; use g=10m/s 2 ; Projectiles: For measured from the +x axis: v x = v cos , v y = v sin , tan = v y / v x ; 0 cos x vt  ;  2 0 1 sin 2 yv t g t ; F D = ½ C D Av 2 (gases) 2 22 0 tan cos g x yx v  ;a centrip = v 2 /r= 2 r; T=1/f=2  ; Forces: F =m a ; F AB = F BA , f k = k F N , f s s F N ; =tan max ; Atwood pulley system: 21 2 1 12 () ; mm m m ag Tg  Remember that unless otherwise noted you must ALWAYS explain your reasoning clearly. Even if the final result is correct, you will lose points for incoherent answers. _______________________________ I. (7 pts each) For the multiple choice only : No explanation is needed if your answer is correct. Justify your answer with well chosen words or a formula and you may receive partial credit even for a wrong answer---but use your time wisely. 1. E _ The position of an object at equal time intervals is shown below: Which graph below correctly represents position versus time for this object?

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