Two masses are suspended by cord that passes over a pulley with negligible mass. The cord also has negligible mass. One of the masses, 
has a mass of 6.0 kg and the other mass,
has a mass of 4.0 kg. The force of the cord attached to 
is
A. 47 N upward.
B. 47 N downward.
C. 33 N upward.
D. 33 N downward.
E. 15 N upward.
A. 47 N upward.
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A meson is a subatomic “particle” consisting of a quark–antiquark pair. Suppose we have a meson consisting of an up quark and a much more massive bottom antiquark. The interaction between these point-like quarks is purely attractive, like that between oppositely charged particles. Which of the idealized models in this chapter might best describe this system’s possible energy values?
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