If a tree is 15 m tall, its height expressed in feet is x ft, where x is
A) less than 15. B) greater than 15.
B
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Why is Pluto now considered to be a Kuiper-belt object?
What will be an ideal response?
The exchange particles for the weak force are very massive (about 100 times as massive as a proton). This would lead one to expect that the weak force would
A) act over a very long range. B) be transmitted at the speed of light. C) act over a very short range. D) only act on very massive particles.
What makes direct imaging of exoplanets possible?
A. Exoplanets are very dim compared to their host star. B. Exoplanets emit their own light in visible wavelengths, where the host star is dimmer. C. Exoplanets reflect light directly toward their host star. D. Exoplanets emit their own light in the infrared, where the host star is dimmer. E. None of these choices are correct.
Why do stars in the disk of a spiral galaxy orbit in roughly the same direction, in the same plane in space?
A) It is pure coincidence; the stars just happen to be going in the same direction. B) After the stars formed, gravity pulled the stars down into a plane in space, all orbiting a supermassive black hole. C) The gas that formed the stars was shaped as a giant, rotating disk. D) Collisions between the stars caused their motions to organize into a general, spinning disk direction.