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PHYS_111_Hill_m87rich_Final_Fall_2002

# PHYS_111_Hill_m87rich_Final_Fall_2002 - PHYSICS 1 l 1 FINAL...

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Unformatted text preview: PHYSICS 1 l 1 FINAL EXAM FALL 2002 55. A 2000 kg car starting from rest reaches a speed of 20 m/s in 8 3. What is the force (assumed constant) that the engine exerts on the car? Assume negligible effects due to friction. A. 1000 N B. 2000 N C. 3000 N D. 4000 N 56. A 10 kg projectile is launched with an angle of 30° with respect to the horizontal as shown to the right. The initial speed of the projectile is 80 m/s. How far in the horizontal direction does the projectile travel? A. 283 m 3.320111 Unify—Fun.“ D. 627 m 3a° ‘\ E. 756 m 57. A 15 kg package is placed on an inclined plane as shown to the right. The coefﬁcient of kinetic friction between package and the plane is 0.12. What is the acceleration of the box down the plane? A. 1.0 111/52 é D. 5.8 this2 E. 9.3 ml's2 58. A 4000 kg truck is initially at rest at the bottom of a bill as shown to the right. What was the total work done on the car if it reaches the top of the hill with a speed of 20 m/s? Neglect frictional losses. A. 0.80 x 5 6 B.1.5><10] cow/ﬂ. c. 2.1 x 10W x 030 D. 2.8 x 106 J 5-3?" ' m 13.3.5 x106} ‘ 59. A 5 kg mass initially at rest at point A slides to the right without friction. Determine the speed of the mass at point B. B. 14 this2 C. 17 m/s2 D. 21 m/s2 E. The mass never reaches point B. 60. A 100 kg cannon at rest contains a 10 kg cannon ball. When ﬁred, the cannon ball leaves the cannon with a speed of 90 mfs. What is the recoil speed of the cannon? A. 4.5 m/s C. 45 Ms D. 90 mfs E. zero 61. A constant force of 2.0 N acts on a circular saw of mass 0.5 kg and radius of 12 cm as shown to the right. If the saw starts from rest, how long does it take the saw to reach a speed of 20 rev/s? “F. 2 .2. 3 3 mpow taxman Uime 62. A point mass of 5 kg is placed at each end of a long thin uniform pole of mass 20 kg that is pivoted at its center as shown to the right. What is the moment of inertia of the rotating system? A. 1.7 lag/m2 B. 2.5 kiim2 W“ w I . . _ I I I D.4.8kg/m2 <_ ___h~c_ _->; E. 5.5 kg/m2 63. 64. 65. 66. 67. E. 13.5 x 10—10 B.2.35N Masses A, B and C shown to the right are each point masses of 8 kg separated by 2 111. What is the magnitude of the net gravitational force on mass A ﬁrom masses B and C? A a- Add; '3 C, A guitar string 60 cm long with a mass of 1.2 grams vibrates in its second harmonic. What tension is needed to produce a sound with a ﬁ'equency of 800 Hz? A. zero B. 4.6 x 10“10 N C. 7.3 X 10“10 N D. 10.5 X10_10 N A. 230 N . 690 N D. 922 N E. 2nd harmonic does not exist A 1.50 kg mass of iron is dropped into a pool of water. Once it is submerged what is the buoyant force on the iron? C. 6.89 N D. 9.25 N E. 14.7 N In a lecture demonstration a vessel was ﬁlled with colored water and allowed to shoot out through a small hole in the bottom. What is the speed of the water as it leaves the hole when the hole is 20 cm below the surface of the water? Hint: Use Bernoulli's equation and neglect the speed of the surface of the water as it decends. A. 0.40 m/s B. 0.80 m/s C.1.2m/s D.1.6m/s Two bimetallic strips A and B similar to the one used in a lecture demonstration are clamped at their base as shown to the right. If the two strips are heated what happens? A. A bends to the right and B bends to the left. B. A bends to the left and B bends to the right. A B C. Both A and B bend to the right. @80th A and B bend to the leﬁ. . A and B increase in length but do not bend. 68. 2 kg of copper at a temperature of 45 0°C is placed in a 1 kg aluminum cup containing 1.5 kg of water at 20°C. What is the temperature of the mixture after it reaches equilibrium? Assume that no heat is lost to the surroundings. Hint: The ﬁnal temperature is less than 100°C. A. 28°C B. 40°C C. 54°C E. 74°C 69. How much heat is lost in one minute through a 1 m by 2 In glass window 0.40 cm thick when one side of the glass is at 20°C and the other is at -10°C? A. 3.9 x 105 J 13.4.? x 105 J C.5.3 x 105 J D. 6.2 x 105 J 70. The sun is a star with a surface temperature of about 6000 K and aradius of 7.0 x 105 km. How much energy is emitted by the sun in 1 second? Assume emissivity of sun is unity. A. 2.6 x 102‘5 C. 6.2 x 102'5 D. 3.1 x 1026 E. 9.3 x 1026 A bottle that has a volume of 0.5 m3 contains oxygen molecules at a pressure of 2 atmospheres and a temperature of 20°C. Oxygen is a diatomic molecule. 71. What is the mass of the oxygen in the bottle? A.0.32kg B.0.65kg D.2.6kg E.3.9kg 72. What is the root-mean-square velocity of the oxygen molecules in the bottle? A. 336 mfs B. 392 mfs C. 443 m/s D. 478 mfs E. 532 this 73. Neon gas at 20°C is conﬁned within a rigid vessel. It is then heated until its pressure is doubled. What is the ﬁnal temperature of the gas? Assume neon is an ideal gas. A. 10°C B. 20°C (3. 40°C E. 586°C 74. How much heat is needed to convert 2 kg of ice at 0°C to steam at 100°C? A.34x104JB.45x105J D.75 X 1051 E.92><105.1 75. A phase diagram for carbon dioxide (C02) is shown to the right. Below a pressure of ' kPa, liquid carbon dioxide does not exist and a minimum pressure of 7373 kPa is needed to liquify carbon A W dioxide at room temperature. 3.3 =- A. 101, 5707 B. 101 7373 D. 516, 7373 E. 5707, 516 101 _ Tmpenhue, T('C) 76. A copper rod 1 m in length and 1.5 cm in diameter is subjected to a force of 5000 N as shown to the right. How much does the rod stretch? A. 0.13 mm B. 0.26 mm C. 0.38 nnn D. 0.52 mm B. 0.76 mm 77. In class the lecturer placed a small piece of cotton on the end of a piston and quickly used it to compress the air in a glass tube. The air heated adiabatically and the cotton ignited. B. The air cooled adiabatically and the cotton froze. C. The air compressed but remained at approximately a constant temperature. D. The air heated isothermally and the cotton ignited. E. The air cooled isothermally and the cotton froze. 78. A Carnot steam engine is used to lift a 5000 kg mass vertically a distance of 2 m. Assuming the steam in the boiler is at a temperature of 400°C and it exhausts at a temperature of 150°C, what is the amount of steam energy needed to lift the mass? Hint: First determine the work needed. A. 0.82 X 105 J B. 1.23 x 105 J C. 1.46 x 105 J D. 1.84 x105 J ...
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