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Round Two

Round Two. Nuclear/Atomic. Anything Goes. Fluids/Thermo, Waves/Optics. Kinematics. E&M. 100. 100. 100. 100. 100. 200. 200. 200. 200. 200. 300. 300. 300. 300. 300. 400. 400. 400. 400. 400. 500. 500. 500. 500. 500. N. N. B. C. A. N. f. f. W. f. W. W. N. E.

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Round Two

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  1. Round Two Nuclear/Atomic Anything Goes Fluids/Thermo, Waves/Optics Kinematics E&M 100 100 100 100 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500

  2. N N B C A N f f W f W W N E N D f W f W Kinematics 100 • Which of the following diagrams best represents the gravitational force W, the frictional force f, and the normal force N that act on the block?

  3. Kinematics 100 and 200 • A 2-kilogram block slides down a 30° incline as shown with an acceleration of 2 meters per second squared. Back to 100 2 kg Back to 200 30°

  4. Kinematics 200 • The magnitude of the frictional force along the plane is most nearly • 2.5 N • 5 N • 6 N • 10 N • 16 N

  5. Kinematics 300 • When a person stands on a rotating merry-go-round, the frictional force exerted on the person by the merry-go-round is • Greater in magnitude than the frictional force exerted on the person by the merry-go-round • Opposite in direction to the frictional force exerted on the merry-go-round by the person • Directed away from the center of the merry-go-round • Zero if the rate of rotation is constant • Independent of the person’s mass

  6. Kinematics 400 • Each of five satellites makes a circular orbit about an object that is much more massive than any of the satellites. The mass and orbital radius of each satellite are give below. Which satellite has the greates speed? MassRadius • ½ m R • m ½ R • m R • m 2R • 2m R

  7. K A t K E t Kinematics 500 • From the top of a high cliff, a ball is thrown horizontally with initial speed vo. Which of the following graphs best represents the ball’s kinetic energy K as a function of time t? K K B C t t K D t

  8. Thermodynamics 100 • An ideal gas confined in a box initially has pressure p. If the absolute temperature of the gas is doubled and the volume of the box is quadrupled, the pressure is • 1/8 p • ¼ p • ½ p • p • 2p

  9. Waves 200 • A vibrating tuning fork sends sound waves into the air surrounding it. During the time in which the tuning fork makes one complete vibration, the emitted wave travels • one wavelength • about 340 meters • a distance directly proportional to the frequency of the vibration • a distance directly proportional to the square root of the air density • a distance inversely proportional to the square root of the pressure

  10. Optics 300 • An illuminated object is placed 0.30 meter from from a lens whose focal length is -0.15 meter. The image is • inverted, real, and 0.30 meter from the lens on the opposite side from the object • upright, virtual, and 0.30 meter from the lens on the oppostie side from the object • upright, real, and 0.10 meter from the lens on the same side as the object • upright, virtual, and 0.10 meter from the lens on the same side as the object • inverted, real, and 0.10 meter from the lens on the same side as the object

  11. Waves 400 • A cord of fixed length and uniform density, when held between two fixed points under tension T, vibrates with a fundamental frequency f. If the tension is double, the fundamental frequency is • 2f • f • f/2

  12. Thermodynamics 500 • Heat is added at a constant rate to a sample of pure substance that is initially a solid at temperature To. The temperature of the sample as a function of time is shown in the graph. From the graph, one can conclude that the • substance sublimes directly from the solid phase to the vapor phase • melting point is T2 • specific heat is greater for the liquid phase than for the solid phase • heat of fusion and heat of vaporization are equal • specific heat of the solid increases linearly with temperature

  13. Thermodynamics Info 500 Temperature T2 T1 T0 Time 0 Back to 500

  14. Electricity and Magnetism 100 • The electron volt is a measure of • charge • energy • impulse • momentum • velocity

  15. Electricity and Magnetism 200 • A solid conducting sphere is given a positive charge Q. How is the charge Q distributed in or on the sphere? • It is concentrated at the center of the sphere. • It is uniformly distributed throughout the sphere. • Its density decreases radially outward from the center. • Its density increases radially outward from the cneter. • It is uniformly distributed on the surface of the sphere only.

  16. 4 4 Electricity and Magnetism 300 • Which two arrangements of resistors shown have the same resistance between the terminals. • I and II • I and IV • II and III • II and IV • III and IV 1 1 2 2 I. II. 2 2 IV. III.

  17. Electricity and Magnetism 400 • There is a counterclockwise current I in a circular loop of wire situated in an external magnetic field directed out of the page. The effect of the forces that act on this current is to make the loop • expand in size • contract in size • rotate about an axis perpendicular to the page • rotate about an axis in the plane of the page • accelerate into the page

  18. Electricity and Magnetism 500 • A parallel-plate capacitor is charged by connection to a battery. If the battery is disconnected and the separation between the plates is increased, what will happen to the charge on the capacitor and the voltage across it? • Both remain fixed. • Both increase. • Both decrease. • The charge increases and the voltage decreases. • The charge remains fixed and the voltage increases.

  19. Nuclear/Atomic 100 • A 1.0 m stick and a clock move with a speed 0.8 c relative to an observer. If the stick is aligned parallel to the direction of motion, its observed length is most nearly • 0.6 m • 0.8 m • 1.0 m • 1/0.8 m • 1/0.6 m

  20. Nuclear/Atomic 200 • A 1.0 m stick and a clock move with a speed 0.8 c relative to an observer. If the stick is aligned perpendicularly to the direction of motion, its observed length is most nearly • 0.6 m • 0.8 m • 1.0 m • 1/0.8 m • 1/0.6 m

  21. Nuclear/Atomic 300 • A 1.0 m stick and a clock move with a speed 0.8 c relative to an observer. Compared to clocks at rest relative to the observer, the moving clock will seem to the observer to run • slower, at about 0.6 times the rate of the clocks at rest • slower, at about 0.8 times the rate of the clocks at rest • at the same rate as the clocks at rest • faster, at about 1/0.8 times the rate of clocks at rest • faster, at about 1/0.6 times the rate of clocks at rest

  22. Nuclear/Atomic 400 • According to the Bohr model of the atom, electrons orbit the nucleus in definite orbits. According to the laws of classical physics, this model would be impossible because • the positively charged nucleus attracts the electrons • Coulomb’s law applies • accelerating electrons radiate energy • there is a centripetal force on the electrons • angular momentum is conserved

  23. Nuclear/Atomic 500 • Electrons that have been accleerated from rest through a potential difference of 150 volts have a de Broglie wavelength of approximately 1 Ångstrom (10-10 meter). In order to obtain electrons whose de Broglie wavelength is 0.5 Ångstrom (5 x 10-11 meter), what accelerating potential is required? • 37.5 V • 75 V • 300 V • 600 V • 22, 500 V

  24. Anything Goes 100 • In the circuit shown, what is the value of of the potential difference between points X and Y if the 6-volt battery has no internal resistance? • 1 V • 2 V • 3 V • 4 V • 6 V 4 X 6 V 6 3 Y

  25. Anything Goes 200 • A point P is 0.50 meter from a point charge of 5.0 x 10-8 coulomb. The intensity of the electric field at point P is most nearly • 2.5 x 10-8 N/C • 2.5 x 101 N/C • 9.0 x 102 N/C • 1.8 x 103 N/C • 7.5 x 108 N/C

  26. Anything Goes 300 • A point P is 0.50 meter from a point charge of 5.0 x 10-8 coulomb. The electric potential at point P is most nearly • 2.5 x 10-8 V • 2.5 x 101 V • 9.0 x 102 V • 1.8 x 103 V • 7.5 x 108 V

  27. Anything Goes 400 • When the frictionless system shown is accelerated by a for of magnitude F, the tension in the string between the blocks is • 2 F • F • 2/3 F • 1/2 F • 1/3 F F 1 kg 2 kg

  28. Anything Goes 500 • The energy level diagram is for a hypothetical atom. A gas of these atoms initially in the ground state is irradiated with photons having a continuous range of energies between 7 and 10 electron volts. One would expect photons of which of the following energies to be emitted from the gas? • 1, 2, and 3 eV only • 4, 5, and 9 eV only • 1, 3, 5, and 10 eV only • 1, 5, 7, and 10 eV only • Since the original photons have a range of energies, one would expect a range of emitted photons with no particular energies. 0 Ionization State -1 eV -3 eV -5 eV -10 eV -14 eV

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