You want to determine whether a mystery object is a neutron star or a white dwarf. Which of the following properties would demonstrate that it is definitely a neutron star?
A) It emits most strongly in visible and ultraviolet light.
B) It is surrounded by a planetary nebula.
C) Every decade or so, it erupts in a nova explosion.
D) It dims and brightens more than twice per second.
D
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The magnetic moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
a. r. b. v. c. vr. d. evr. e. mNvr.
Each dot on this graph represents an extrasolar planet detected over about a four-year period by the Kepler mission. Suppose the mission had been able to continue collecting data for many more years. How would you expect the graph to look different in that case?
A) Additional dots would be found further to the right. B) Additional dots would be found above the existing dots. C) Additional dots would be found further to the left. D) All the existing dots on the graph would move diagonally up and right.
The number of deaths from the Chernobyl accident is about
A. less than 1 B. 24,000 c. 124,000 D. over a million
The net force on an object in the positive x direction. Consider the following statements: i) The object can be moving in the negative x direction. ii) The object can be speeding up. iii) The object can be slowing down. iv) The object can be moving in the positive y direction. Which of the statements are true?
a. (i) and (ii) b. (ii) and (iii) c. (iii) and (iv) d. Choose this answer if all the statements are true.