Baryons are composed of
A. any odd number of quarks.
B. three quarks of matching color.
C. three quarks of three different colors.
D. a colorless quark-antiquark pair.
C. three quarks of three different colors.
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Kepler's third law of planetary motion states, "A planet's _____ squared is proportional to its average distance from the Sun cubed."
a. radius b. diameter c. rotational speed d. orbital period e. rotational period
Why is the sky blue during the day?
What will be an ideal response?
Imagine that, at a certain point in empty space, the curl of the magnetic field has a positive x component. What can we conclude from this information?
A. Ex must be positive at that point. B. Ex must be negative at that point. C. Ex must be zero at that point. D. Ex must be increasing with time at that point. E. Ex must be decreasing with time at that point. F. The magnetic field described is not physically possible. T. None of the above.
A point charge Q is placed at the origin. A second charge, 2Q, is placed on the x axis at x = ?3.0 m. If Q = 50 ?C, what is the magnitude of the electrostatic force on a third point charge, ?Q, placed on the y axis at y = +4.0 m?
a. 2.5 N b. 3.0 N c. 3.7 N d. 4.4 N e. 1.8 N