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Unformatted text preview: PHYSICS l l 1
FINAL EXAM
FALL 2003 55. A 1.0 kg rock is dropped from a highway bridge over a river and hits the river 2.5 s after it's
release. Neglecting air friction, how high is the bridge over the river? A. 14m
B. 19m
C.25m (EB E. 38111 56. A 30 kg box is pulled along a level ﬂoor with a force of 100 N as shown to the right. The
coefﬁcient of friction between the box and ﬂoor is 0.20. Starting from rest how long will it take for the box to reach a speed of 8.0 m/s? l l—>F A. 2.4 s
B. 4.2 s
D. 7.3 s
E. 9.1 s 57. Two boxes A and B each with a mass of 20 kg are connected with a massless rope as shown in
the ﬁgure to the right. The surface of the inclined plane is frictionless. What is the acceleration
of the system? A. 1.3 m/s2 C. 4.9 m/s2
D. 6.8 I'D/52
E. 9.8 m/s2 58. A 5.0 kg block compresses a spring a distance of 10 cm as shown to the right. The force constant
for the spring is 2.0x104 N/m. The block is then released and moves on a horizontal frictionless
surface. What is the speed of the mass just as it looses contact with the spring? A. 2.0 m/s2
B. 3.2 m/s2
C. 4.7 m/s2
D. 5.4 m/s2 59. A cart A of mass 3.0 kg initially moves to the right with a speed of 1.0 m/s. It collides head on with cart B of mass 5.0 kg that is moving to the left with a speed of 2.0 m/s. After the collision
cart A moves to the leﬁ with a speed of 1.0 m/s. What is the velocity of cart B aﬁer the
collision?Hint: One dimensional problem, Draw a diagram. A. zero B. 0.8 m/s to the right
D. 2.0 m/s to the right
E. 2.0 m/s to the leﬂ 60. A massless cord is wrapped around a solid cylindrical wheel of mass 5.0 kg as shown to the 61. right. The force on the cord is 8.0 N. Starting from rest what is the angular speed of the wheel
after 30 s? B. 92 rev/s
C. 136 rev/s
D. 285 rev/s
E. 435 rev/s F A merrygoround rotates without friction. A child on the merrygoround walks from the center
along a radius and then jumps oﬁ‘ the merrygoround. What does the merrygoround do during
this sequence? A. The merrygoround rotates faster.
B. The merrygoround rotates slower.
C. The merrygoround rotates faster and then slower.
@I'he merrygoround rotates slower and then faster.
E. The speed of the merrygoround does not change due to the
child's motion. M 62. A horizontal plank of length 10 m and weight 100 N is shown to the right. It rests on two
supports. How close to one end can an 800 N person stand without causing the plank to tip? A.0m I I
am
D.0.6m
E.0.8m 63. The radius of the earth is 6.37x103 km. Using this fact calculate the mass of the earth? A. 2.0x1024 kg
B. 4.0x102‘k
D. 8.0x1024 kg
E. 10.0x102‘ kg 64. An organ pipe 50 cm long and open at one end is sounding a tone that is it's third harmonic.
What is the frequency of this sound? A. The third harmonic does not exist for this pipe.
B. 172 Hz ‘ C. 368 Hz D. 425 Hz 65. What is the minimum amount of force needed to completely submerge a 1.0 kg of Styrofoam in
water? Hint: First draw force diagram for the Styrofoam. A. ION
B. 49N D. 98N
E.110N \— 66. Oil of density 925 kg/m3 is ﬂowing through a pipeline at a constant speed when it encounters
a vertical bend in the pipe raising it 4.0 m as shown to the right. The cross sectional area
of the pipe is constant. What is the difference in pressure P(B)P(A) in the pipe? PointB
—> . T
A. +2.4x104 Pa 40'“
 11
c. +5.1x10 Pa 0—>
D. 7.2x1o5 Pa 90mm E. 1.8x103 Pa 67. The ﬁlament in an evacuated 100 W light bulb has a surface area of 7.0x10'5 m2. What is the
temperature of the tungsten ﬁlament assuming it is a perfect emitter (emissivity is l).
Hint: Assume the temperature of the surroundings has a negligible effect on the answer which is
true. ’ B. 2155 °C
C. 2438 °C
D. 2693 °C
E. 2912 °C 68. In a lecture demonstration a candle was bunting at the bottom of a glass tube and then a metal
partition was added as shown to the right. The candle without the partition and the candle
with the partition in place. A. continued to burn, eventually stopped burning
ventually stopped burning, continued to burn C. continued to burn, continued to burn D. eventually stopped burning, eventually stopped burning 69. The quarkgluon plasma is best characterized as: A state of nuclear matter at extremely high temperatures.
B. A state of nuclear matter at extremely low temperatures.
C. The state of matter in the universe 10 minutes aﬁer it's creation in the "big bang".
D. A mixture of protons, neutrons and electrons at very high temperatures.
E. A state of ionized atoms at high temperatures. 70. What is the approximate age of the universe? A. 6000 years
B. 1.5méHiJn’years
C. 4.543%” years
® 13 millien years
E. 22mi~llien years BlLLlON 71. A bottle with a volume of 0.20 m3 contains 500 g of sulfur dioxide (802) at room temperature
(20 °C). The atomic weights of oxygen and sulfur are 16 g/mole and 32 g/mole, respectively.
What is the pressure that the gas exerts on the bottle? A. 0.95 x 105 Pa
B. 1.25 x10 Pa
c. 1.67 x105 Pa D. 2.25 x 105 Pa
E. 2.98 x 105 Pa 72. An ideal gas with a ﬁxed number of molecules is maintained at a constant pressure. At 30.0 °C,
the volume of the gas is 150 m3. What is the volume of the gas when the temperature is
increased to 75.0 °C? A. 0.60 m3 B. 1.30 m3 D. 2.45 m3 E. 3.75 m3 73. Carbon dioxide gas is in a sealed container at a constant temperature. Which of the statements
below is true? A. All molecules move with the same speed.
B. Most of the molecules have the same kinetic energy.
C. The lower the temperature, the greater the speeds of the molecules.
D. All molecules possess the same momentum.
e molecules have a range of kinetic energies. 74. A SOlld sphencal steel ball 20 cm in diameter falls off an ocean liner and smks to the bottom of
the ocean 2000 m below the surface. What is the percentage change in the volume of the ball? B. 0.018%
C. 0.024%
D. 0.036%
E. 0.043% 75. 50 grams of ice at 0°C is added to an aluminum calorimeter cup of mass 300 g containing
200 g of liquid water at 60°C. Assume no exchange of heat with the surroundings. What is
the ﬁnal temperature once the system reaches equilibrium? Hint: This problem takes longer than most. A. 1] °C
B. 18°C
C. 29°C E. 45 °C 76. If you take water to the top of Pike's peak at over 14,000 feet in elevation, its freezing point and
boiling point are and , respectively than in Ames. A. They are the same as in Ames.
B. lower and lower
C. higher and higher D. lower and hi er T T ' T T
. I t 2 c
. higher and lower Temperahue.T('C) 7. 2.0 moles of He gas at a temperature of 20°C are enclosed in a rigid, sealed and insulated
container. How much heat must be added to raise the temperature to 50°C? 7 A. 5.6x102 J
931mm
c. 8.2x1I J
D. 8.9x102 J
E. 9.6x102 J 78. Which of the statements below best describes an adiabatic process? A. The internal energy does not change.
No heat enters or leaves the system.
C. No work is done on or by the system.
D. The volume of the system does not change.
E. The pressure of the system does not change. ...
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 Summer '08
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