Is the cosmological red shift really a velocity of a given galaxy?
What will be an ideal response?
No, it is a measure of how fast the entire universe is expanding in spacetime, with the galaxy just taken along for the ride.
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What does Einstein's general theory of relativity tell us about two co-orbiting white dwarfs?
A) They will emit gravitational waves that carry energy and angular momentum away from the system, causing the white dwarfs to gradually spiral inward toward each other and eventually merge. B) They will emit gravitational waves that carry energy and angular momentum toward the system, causing the white dwarfs to gradually spiral away from one another and eventually fly far apart. C) They will emit gravitational waves that carry energy and angular momentum away from the system, causing the white dwarfs to quickly spiral away from one another. D) They will never interact with one another.
The following statements refer to man-made, artificial satellites in orbit around Earth. Which is an accurate statement?
A) The velocity required to keep a satellite in a given orbit depends on the mass of the satellite. B) The period of revolution of a satellite moving about the Earth is independent of the size of the orbit it travels. C) A satellite in a large diameter circular orbit will always have a longer period of revolution about the Earth than will a satellite in a smaller circular orbit. D) It is possible to have a satellite traveling at either a high speed or at a low speed in a given circular orbit. E) Only circular orbits are possible for artificial satellites.
Would bile salts be effective if they were polar molecules instead of amphiphilic molecules?
A. If bile salts were polar molecules they would be effective because they will be able to interact with the micelle. B. If bile salts were polar molecules they would be ineffective because they would not be able to interact with water molecules. C. If bile salts were polar molecules they would be effective because they will be attracted to the fatty acid tails of the lipids. D. If bile salts were polar molecules they would be ineffective because they would not be able to interact with lipids.
Refer to the graph. The object moves forward
A. in region A. B. in region B. C. in regions A and C. D. The object always moves forward E. The object never moves forward