What would be most likely to disrupt the normal evolution of a star? Give examples of this
What will be an ideal response?
If it has a close companion, mass transfer may change the masses of both stars and greatly change the evolutionary tracks of both stars. Nova and type I supernovae are both created by mass transfer changes.
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Why is it believed that life can not evolve on a planet that orbits a spectral type A, B or O star?
a. These stars produce too much infrared radiation which would destroy carbon-based organisms. b. These stars have very small life zones. c. These stars are not capable of producing planets. d. These stars do not remain on the main sequence long enough for life to evolve. e. These stars take too long to form.
If a rectangular area is rotated in a uniform electric field from the position where the maximum electric flux goes through it to an orientation where only half the flux goes through it, what has been the angle of rotation?
A) 45° B) 26.6° C) 90° D) 30° E) 60°
The current in a 100-W bulb connected to a 120-V source is
A) 0.5 A. B) 1.2 A. C) 12,000 A. D) none of the above
Two nonparallel vectors determine a plane. Relative to the plane determined by the position vector where the force is applied and the force vector, in which direction is the torque vector about the origin?
A) perpendicular to the plane B) in the plane, but perpendicular to both the position vector and the velocity vector C) in the plane, but perpendicular to the velocity vector D) in a direction dependent on the magnitudes of the velocity and position vectors E) in the plane, but perpendicular to the position vector