Answer the following statement(s) true (T) or false (F)
1. There is an electric field in the bar’s rest frame.
2. There is a magnetic field in the bar’s rest frame.
1. TRUE
2. TRUE
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If the Sun is in front of a constellation of the Zodiac (for example, Virgo), it takes about one ________ to pass through all the Zodiac constellations and once again be in front of the same constellation.
Fill in the blank(s) with the appropriate word(s).
Binary black holes have much higher masses than their white dwarf and neutron star counterparts, which should lead to a much stronger emission of gravitational waves
What is the most reasonable explanation for why we have not yet observed gravitational waves from black-hole binaries? A) Black hole binaries are very rare, and wave detection is difficult. B) The waves disappear into the black hole. C) The waves must be coming from very far away and haven't reached us yet. D) Our current theories must be wrong.
The idea of dark matter arose to explain gravitational effects observed in galaxies and clusters of galaxies
However, studies of the early universe (especially of the cosmic microwave background and of chemical abundances) also tell us something about dark matter. What do they tell us? A) They add further support to the idea that dark matter really exists and is made of non-ordinary (nonbaryonic) matter, such as WIMPs. B) They do not support the conclusion that dark matter is the dominant form of matter in the universe. C) They tell us that dark matter probably exists, but that it must be made of ordinary (baryonic) matter in the form of MACHOs. D) They tell us that dark matter was produced during the era of nuclei.
A double convex lens has faces of radii 18.0 cm and 20.0 cm. When an object is placed 24.0 cm from the lens, a real image is formed 32.0 cm from the lens. Determine:
(a) the focal length of the lens. (b) the index of refraction of the lens material.