Why do we generally rule out stars with masses more than a few times that of the Sun when we consider star systems where life could be possible?
What will be an ideal response?
Answer: Their stellar lifetimes are too short to allow enough time for life to evolve.
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The number of Bohr magnetons per atom for Co is 1.72. Calculate the saturation magnetization for Co.
What will be an ideal response?
Which of the following statements about the cosmic background radiation is not true?
A) It has a temperature of about 3 degrees K above absolute zero. B) It appears essentially the same in all directions (it is isotropic). C) It had a much higher temperature in the past. D) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies that formed within the first billion years of the Big Bang. E) It was discovered by Penzias and Wilson in the mid-1960s.
The absolute pressure depends on
a. the weight of the fluid. b. the atmospheric pressure. c. the cross-sectional area. d. the gauge pressure.
When two bodies of different masses collide, the impulses they exert on each other are
a. equal for all collisions. b. equal but opposite for all collisions. c. equal but opposite only for elastic collisions. d. equal but opposite only for inelastic collisions. e. equal but opposite only when the bodies have equal but opposite accelerations.