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PHY 213 Exam #1 Prof. J. Rolllno _. lg 10f909
‘ /3 052 x /C}rﬂ45 y M J
1) A. 150 kgirm3 = a 16 O gimma' "hi3 "' 3 arm.“
6 (EL/Mg Zibﬂxéefj ,«o‘m’o‘
B. 250kmihr=  )‘ omis. M géom I‘m“
C. A ﬁctitious formula that could relate “blinks” ( b ), to “winks”,( w ). is:
b = am2 + c iog(dw2)
' 2' '  L
What are the units for 'a' ? t) W ‘c'? E 'd'? M,"
(10)
2) A particle moves along the xaxis according to the following equation. ‘x' is in meters and 't’ is measured in seconds. x = 2.50 t3  4.5m2 a. Determine the formula for the instantaneous velocity for this particle. W761} “.— ¥.5‘0t1~'—900f
cit b. Determine the formula for the instantaneous acceleration for this particle. at: A.»— .. moat—WM
ﬁ 0. Calculate the average velocity for the interval t=1.0 to t=3.0 seconds. ' ..__ ‘ .—.\ M [1 if .S‘
5(0) 2.5‘0 (3)3— 9.40 (UL ‘1 $9 ‘* 3,42: xcn = 2.54:)" ' t“ H) (161.2: :1. Calculate the avegge acceleration for the interval t=1.0 to t = 3.0 seconds. 0! r Cs __ ‘ “(5) ' 5,24,! 4: 2f. (Hui/[1  L \ L: *M 29.0)  6/0) we Au» 2w 912.0 e. Calculate at what times(t) the particle will be at x = 0.0 meters. 0 : 9?.5‘izg‘ V4371
0 ‘ f Y. fs'vf  54m) (15) 3) A car accelerates at a(t) = 3.0012 2.00t from rest. a. Caicuiatgithe particle's veffity at the end of 2.00 seconds. .='W=£?t1—zb#: its—(1 7 +004; 0 b. Determine the displacement from the original pzo'sition. ' 1: Qt .wﬁf’.t‘m 111.19 $255; £33m __.—— ‘r 5 3
o U (10) 4) Assume you're standing on a ledge 50.0 meters above the ground and you drop a bail. 1.00 seconds later your friend
VOJ throws a ball straight down at 20.0 mis. Which ball hits the ground ﬁrst? How much time elapses between the hits. “300 = Amt: 1=fue’"—’b?:3 = *t."tt‘_20£’ "9911—Mrrr c) T ‘t “gilt201': 5‘c = c) 3 lqv
I] 2‘74
1 20 J: 401') ~Ct‘n‘!)(9)('i3)
1.2%.!qu ‘61— ("II FUEL/D (1ou
‘ ~70 4 9/001 190 £qu 0 CL? ‘1' a, y o ﬂ —2.0H + 34‘? {7575 (10)
GHQ 7‘ "H 6‘0 H o
5) Suppose you walk the fotlowing two paths: 150 meters @ 12 ° and 100 meters Q 225°; but your tﬁend walks 100 meters @ 30° and 150m @270. Knowing that you both started from the 3 me position. how fangnd in what at '
should you walk to meet her?  K; —.——> m 100 w 30?} + loo .0» 30‘?
#50 an 2%? + W01” 29?”? __ C4.) SIG
ﬂ__ #2327} Ii‘rﬁ'ﬁ (9 ~ ’"
NEEr ——/5""7':}' . '1,
M55”: t, (23235)?" U‘I’JB (1o) Consider the vectors:
A=2ij4k and B=2j+5k Calculate: a.AoB= 2 '—I ‘37 A __
O 2 #2e I13 3A= .__’2_:: +— g/ﬁ‘ A /\ A _QQ+3§+ALK ~»5?+J+’7“
H c.AXB= A A /‘ 10A #4 (4“ ?) An.€*"‘3‘* J K d. the angle between A and B Q 4 ___.._‘ _:4  ‘: CJ‘S C"
COKE) 2' ' \J—Z—T 2 1
A B . <0
: {36.9 (“QTQL/iIéfI fur27
I3 whim =‘ (a? (20) When a certain softball player throws a softbaliwith an initial angle of 60°. the ball reaches herteammate 30.0 meters
away. Her teammate catches the bail at the same height as it was reieased. For how many seconds was the ball in theair‘?
"1 . t roan«o
Raﬁ/{:11}; 26;“ (43 at) : Zliﬁd lg .2 I 0
'  ' 65.
_ 91"? (30) 7.2)(“3 )
0 git} (20" ‘
&= 32¢; (m
h ‘ g’Y’m
m0 2 j’& 3) 9) If a highway exit has a radius of 65.0 meters and the great acceleration the tire can produce on a wet road is 5.00 ml's2
, what is the fastest speed a car can exit without skidding? Q T 40:}
{q . ‘ . _ __._.. /r 0'1 i/LP‘SMCK/i ‘3 1‘5o0>(“’£°) S: (5) A pilot wishes to fly with a heading of 115° at 150 rnfs. The prevailing wind is blowing at 20.0 ms at direction of 300°.
With what air velocity must she ﬂy? Give the magnitude and direction. These are lab coordinates. Give your answer
in lab oomdinates. '._——I H “’1‘ ~23 P/é ’ N/‘TM “4* iii/c. [Lg/.42 : Wm _" ACE/c
>< N34 : A514 mm:— zowem“ : _ 435‘} ' x _ (10) ﬂ “lg/4 j t w
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 Spring '08
 CROFT

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