A space station out beyond the solar system is rotating with constant angular velocity. A spaceship heading into the station along a diameter of the station, uses its rockets to brake, and then docks inside the station at its center. When the spaceship docks, the angular momentum of the system consisting of the station and ship
a. is less than the original angular momentum of the station.
b. is the same as the original angular momentum of the station.
c. is greater than the original angular momentum of the station.
d. is less than the original angular momentum of the station, but the angular velocity increases.
e. is greater than the original angular momentum of the station, but the angular velocity decreases.
b
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Which of the following best describes the development of astronomical telescopes over the past 60 years?
A) Over the 60-year period, telescopes have gradually gotten bigger and more powerful. B) Although there have been advances in cameras and computing power, telescopes themselves have not changed much in the last 60 years. C) The world's most powerful telescope remained the same for most of this period, but in the past 20 years many new and more powerful telescopes have been built. D) The only major change in telescope power has occurred because of our ability to launch telescopes into space rather than operating them only from the ground.
The ________ occurs when a rapidly rotating conductor is stirred by convection to produce a magnetic field
a. dynamo effect b. Zeeman effect c. Babcock effect d. proton-proton chain e. aurora
Process of Science: The theory of spiral arms explain why short-lived, massive stars are found there but longer-lived, low mass stars should last for many orbits around a galaxy and therefore be much more spread out
How might you test that prediction?
Nickel and silver have lattice parameters of 0.352 nm and 0.408 nm, respectively; an electronegativity of 1.8 for each, an FCC structure, and a similar valence. Should they be able to form a continuous-solid solution? _____________
Fill in the blank(s) with the appropriate word(s).