What three factors affect stream speed?
What will be an ideal response?
Answer: Gradient, the steeper the gradient the faster the flow; discharge, the greater the discharge the faster the flow; and channel geometry, (a) water flows slower in large, wide channels than in small narrow channels and (b) water flows faster in round deep channels than in flat shallow channels.
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In a cyanine dye molecule, one electron is free to move up and down along a linear chain of carbon atoms, but cannot pass the nitrogen atoms at each of the chain’s ends. Assume that the length of the chain does not change much as we increase the electron’s energy (within reasonable limits). Which of the idealized models in this chapter might best describe the electron in this situation?
A. The quanton in a box model B. The Bohr model C. The simple harmonic oscillator model
Suppose the Sun were suddenly to shrink in size but that its mass remained the same. According to the law of conservation of angular momentum, what would happen?
A) The Sun would rotate faster than it does now. B) The Sun's rate of rotation would slow. C) The Sun's angular size in our sky would stay the same. D) This could never happen, because it is impossible for an object to shrink in size without an outside torque.
The amount of potential energy possessed by an elevated object is
A) relative to a chosen reference level. B) equal to the work done in lifting it. C) equal to the kinetic energy it will acquire when freely falling to its reference level. D) all of the above
A particle is fired at a target nucleus in which a reaction that could occur has a negative Q value. Which of the following statements is true?
a. The kinetic energy of the bombarding particle can be any amount for the reaction to occur. b. The kinetic energy of the bombarding particle must be equal to the absolute value of the Q value for the reaction to occur. c. The kinetic energy of the bombarding particle was greater than the absolute value of the Q value if the reaction occurred. d. The Q value has nothing to do with whether or not the reaction can occur.