Exam1Solutions - Circle the best answer: 1. Mercury is a...

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Unformatted text preview: Circle the best answer: 1. Mercury is a metal, which is liquid at normal temperature. Its density is 13.534 g/cm3. Its density in kg/m3 is: A. 0.0013534 kg/m3 B. c. D. E. 2. Any two objects always attract each other by gravitational force. If the masses of the two {61 64m 3 87534 @X 112’} » / VJ)“. fl; .rweeififi;j [Og’k‘nrm/3 fill/m} , l3 ‘5 34 X 105 4153342511»? Ln 7 1353.4 kg/m3 13534000 kg/m3 13534 kg/m3 -: _ I 1.3534x10‘6 kg/m3 X ' bodies are M and m and are separated by a distance r, the magnitude of the attractive force is given by F = GMm/r2. In SI, force is measured in newtons (N), distance in meters (m) and mass in kilograms (kg). What is the SI unit of the gravitational constant G? A. B. C. D E. wuow» E6! —‘ 2. kgms’zr f : Il/l M I: 6‘ 5 F r 1:41;: 1 r; > W— I: nounits .9 (AMA/L706 G, : NLMZ ;[)\);m krafl N L» - velofi ‘ : gin/3t _ 0 *[ i: 2.5 SIG 96 1w? 175’” t” 0/ o a I 03%? "2/? A)“ lt:4‘$ ——~— 54f f;Z§ jg +v"€ A‘ZL ‘tzd/ 4.49 a V67 A1 £34: Wield??? The velocity is always positive The velocity is always negative The velocity is positive at t = 0, zero at t = 2 s and negative at F 4 s. The velocity is negative at t = 0, zero at t = 2 s and positive at 1= 4 s. The velocity is positive at t = 0 and negative at t= 2 s and t = 4 s. A. B. C. D. E. 4. What can you say about two vectors a=b for which a + b = E and a+b=c? Nothing, not enough information. They point in the same direction. They point in opposite direction. They either point in the same or in opposite direction. They are perpendicular to each other. 161 a +b‘2c .2. 1': 1+1? :1?) (,4 ‘ o .34 fl [93L 0. f lfl " (J :9 ‘Wxx yum/1,] Vivi“ 4 054M“ rip/C: “bu/M,» 1/) (A, WW! Mn. a (Tn/mm (' 1 r-9 4‘ .‘a .~ +1111] \ 5. From the top ofa 400 ft cliffa boy drops a golf ball A into the water below. Next he throws a second golf ball B horizontally with some speed. Neglecting air resistance, which of the following is true about the time taken, tA and t3, by the ball to splash into the water? [63 A. There is no enough information to calculate tA. y‘ Labgéd S 0 B. There is no enough information to calculate t3. “3’5" / C. tA=tB. Oily _‘: 4' LIA/31 D W ‘3» «W11 - E. tA<tB. ‘ v ’ H f] :_ saw/u: bit/V ‘ r 5 Wk wt]? 5 if}? / 6. A ball drops from the Ambassador Bridge, from a height 56 m above the water. It rec y into a small motorboat moving at constant velocity. When the ball is released, the boat is 23 m behind the point ofimpact. What is the speed of the boat? I H); A. 6.8 m/s 0 _ . . ' ? B. 3.4m/s Y : s— be M . 7 1:0, me bpmt, C. 9.6 m/s v5 . ‘ D. 2.0 m/s Vi — 0 ‘7’ )4 : 23 m E. 4.0 m/s 5\\/ : - [$th é . a T. 0 1% 71 J, t 2’ x K < W/=$;+U,‘;0“/ 4mg)“ ' Z X 13 m _. : s: l 4“ .J— ’6 K 7: (Jr _ : .1!— bé 0 +0 2C 7 XI 335$ # i _ , . 2 ~ . fgéfl/‘qub :r. 6«(?)}Izi«’/5 t r; ’2 3 5 ‘ 4“? _. _ 1‘ 2A. 7. Postion vector ofa particle varies with time in this way: r _ (2‘0 + 5501 _ 1'2t J , where r is in meters and t in seconds. Which ofthe following statement is true? E SW _ vx =5.5m/s,vy=—4.8m/s,a)Ir =O,ay=—2.4-m/s2 : 2g) vx = 7.5m / s,vy = —4.8m / 5,61)‘ = 0,61y = ~2.4m / s2 » vx = 5.5m / s,vy = —4.8m /s,a)c = 0,11), = 2.4m / 32 vx = 5.5m / S,vy = —4.8m / s,ax = —4.8m / 3241y = —2.4m / s7" — —— — — 2 - r " . Viv—7.5m/s,vy ——4.8m/s,ax —O,ay—2.4m/s a) : GPA er 2%,.22tm (—5 i —' ‘ ‘ Z ' 7 4‘ T H”: a V: (2+ 9’*sta«—l'lt J m .3 " .37 x: 2+ east ax: €112 5‘5“ m “Pa; =1 f 2*"th y : —i-2tl Cit :~zx1~2x2 cm : AM: . __ A elm; a? J 8. A soccer ball is kicked from the ground with an initial speed on3 m/s at an upward angle 01°35“. A player 42 m away in the direction of the kick starts running to meet the ball at that instant. What must his average speed be if he is to meet the balljust before it hits the ground? ! I 0'} ’0 Vi": ng/A / (913; g) 2 ., , Z k ‘9 A. 7.4 / ( . W x B. 322/: Rat/99 R; 'Ul KM 29‘ 11% xflw QBS S: 33255 9 Cl ‘3 E. 3.9m/s (2W1, All; pm V y a: -:> %u :WL 7’ ,9ng Form y (507 awn : germ , . . ‘ \f'gum i kx—I. R l—I—f'i X ; 87% t, 2x_#____67 : z x 2%? W535 9. A person of mass 74 kg is standing in an elevator on a spring scale measunng orce in a newtons. The elevator accelerates upwards with an acceleration of 2.3 m/sz. What does th 7 fig spring scale read? [10] Z 2 A. 725 N _ US: (X: (Bi 331137 51-wng balance WWW W6 W trig” - k 0 a l r251 dim/l . v z: , , 13- 895N fm' ‘ l W w l5 2m] E. . 74N06U59Pri‘nfl balm maL. Momma M Wt M’- Lm/ : mm :2‘ 'n v ‘16; 51% n : we; +mm ; ng‘M)‘74 (45)“;2‘3) mg 2 m 10. A block of mass m] = 4.3 kg on a frictionless plane inclined at an angle 6 = 34" is connected with a cord over a mass-less, frictionless pulley to a second block of mass m2=5 .1 kg hanging vertically (see Figure). What is the magnitude of acceleration of the blocks? {in} 96 m, I I FM moJfl'lfiwA film/13) [FL WM? . M C. 1.2 m/s2 D. 1.5 m/s2 E. 3.0 m/s2 IA w 3 mg 11. You are loading up your pickup truck with some boxes. The coefficient of static friction between the boxes and the flatbed in your truck is 0.45. Initially you are driving at 50 km/h. In what distance em you stop your truck at constant acceleration without causing the boxes to slide? l l0} A. 567m FYWHFWW] ‘FVV‘Z' P'”€‘/€”& m 1309‘. fag/W g: aacele’l‘m‘llna ~FWwaréi (/Obew'flu Tit/wall 9’67” D. 111m E. 21.9m *— : VHA 1:) Gt : —-'|£/LH 10—14%: a? 2) m : mg f; PSV): Km? 2 Z . I A _/V«m(9_,m9 wavelmbx U’:O > a __ S 4 _ l I “F > 12. Radius of the Earth at the equator is 6378.14 km. The period of rotation of the earth is 23 hours 56 minutes and 4 seconds. What is the magnitude of the centripetal acceleration of an object on the Earth’s equator due to its rotation? [IO] M 47 . r/lr/ “T r 2 ~~ v » A MAM “ 5QR¥B§INM7L4S L- ' X . bl—T—AZ : 2 3mgst +§é><[email protected] ’ 7%? ;: (géié4g Vifi:50kwi&@:§lflgfli“ éoXéaX R 3 WHOM: 5E7XWXWBVM : [3 4 wk 2 . LR 977/2 .>~I3 6; : 2x(—M)z>x V Vj’ 23X.; [5'fi2 . ‘ - 2h? fl : : :: i%._0(1 I “fig,- R X 170443” X007 f. 4772]? 3 2, 5] Vm __ TL ...
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This note was uploaded on 11/16/2010 for the course CHM 2220 taught by Professor Andreana during the Spring '08 term at Wayne State University.

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Exam1Solutions - Circle the best answer: 1. Mercury is a...

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