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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’} » /
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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.
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——~— 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
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Mn. a (Tn/mm (' 1 r9 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
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E. tA<tB. ‘ v ’ H f] :_ saw/u: bit/V
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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
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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=—2.4m/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 " .
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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
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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 51wng 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
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‘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 massless, 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 .
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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]
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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.
 Spring '08
 ANDREANA

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