Elementary Particles: The proton is made up of which one of the following quark combinations (up, down, strange, charm, top, bottom)?
A. uud
B. ddu
C. udd
D. ttb
E. bst
Answer: A
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Imagine that at a certain place in a river, water moves horizontally to the left. Consider an oriented sur-face that faces in a direction that is 30° upward of right. The flux of water velocity through this surface is
A. positive. B. negative. C. zero. D. Impossible to determine from the given information
Kirchhoff's Rules: A multiloop circuit is shown in the figure, but some quantities are not labeled. Find the current I1 if the batteries are ideal. (It is not necessary to solve the entire circuit.)
A. 0 A B. +0.2 A C. +0.4 A D. -0.2 A E. -0.4 A
What does Kepler's third law imply about planetary motion?
A) All planets orbit the Sun at the same speed. B) Planets closer to the Sun orbit at a slower speed than planets further from the Sun. C) Planets further from the Sun orbit at a slower speed than planets closer to the Sun. D) Planets further from the Sun orbit at a faster speed than planets closer to the Sun. E) This law implies nothing about a planet's motion.
A hoop is rolling without slipping along a horizontal surface with a speed of 4.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal. What is the speed of the hoop after it has rolled 3.00 m up the ramp?
A) 2.80 m/s B) 1.91 m/s C) 2.06 m/s D) 3.79 m/s E) 8.02 m/s