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Unformatted text preview: . : Plijrsics 102
" ' 2008 Summer Session i
' : Instructor: Bennett Kalafut 1 fNérme 50550” amount of water required to I)
40.0 acres in a square miie, and . , .3 M . me)”: (iii «:1U5yd3 3% 2) Two people: take idenﬁcal jet skis across a river,
water. Jet ski A heads directly across the river a
before reaching the opposite shore. Jet ski B travels in a direction that is 35° upstream and
arrives at the opposite shore directly across from the starting point. (22) Which jetski ‘ reaches the ppposite shorein the least amount of time? (b) Confirm your aHSWer to part (a)
by finding the ratio of the time it takes for the two jet skis to cross the river. traveling at the same speed relative to the 2) W
nd is carried. downstream by the current I (a) 32“: 5H4 crew) 5:75! Rr but!“ skier}! '{31' ﬁ\% wrdifq 96 (war 141w 5M¢f 3' t3“ £82 [40,; 33‘” [SFU' 3) Coasting due west on your bicycle at 8. across. When you leave the sandy pa
. (a) Assuming the sand causes 21 const
in the sandy patch? Give both magnitu ﬁle sandy patch? (c) Suppose you enter
your final speed in this case 3.4 m/s, more tch your speed has been reduced by 2.0 ml
ant acceleration, what was the bicycie‘s acceleration Gunter a sandy patch of road 7.2 m 3) W 4 4 m/s, you enc
s to 6.4 mfs de and direction. (b) How long did it take to cross
the sandy patch with a speed of only 5.4 m/s. Is
than 3.4 role, or Less than 3.4 m/s? Explain. any} I“: bacHW/Jg
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y over a raised bar. Suppose the initial Veiociiy of a bale of l = —> A A { hay is v =(I.12 mls)x+(8.85 m/s)y. (a) After what minimum time is its speed equai to 5.00 3 m/s? (b) How long after the hay is tossed is it moving in a direction that is 45.0” below the
ed with the same initial speed, only this time straight ‘ horizontal? Kc) If the bale of hay is toss
ii its time in the air increase, decrease, or stay the same? Expiain. '4) One of the iiiost popuiar even
. ‘pit'c‘nfork tafthrow a bale of ha : upward, wi i“ //
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 Spring '08
 Johnson
 Trigraph, Jet Ski, sandy patch, Bennett Kalafut

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