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?
A. The quanton in a box model B. The Bohr model C. The simple harmonic oscillator model
Binary star systems are thought to form when
A) gravity pulls two neighboring protostars quite close together, but angular momentum causes them to orbit each other rather than collide. B) two interstellar gas clouds happen to contract so close together that there's no room for a disk or planets. C) the protostellar disk around a protostar has enough material to form a second star. D) a protostar emits two jets, each of which turns into a star.
In relativity, two people share the same reference frame only if what is true?
A) They are not moving relative to one another. B) They are both located in the same place. C) They are both located in the same place and are stationary. D) They agree on the laws of nature.
Broken rock debris in the process of soil formation that overlies solid bedrock is called
What will be an ideal response?