Why do some radio galaxies appear to have lobes while some do not
What will be an ideal response?
It's believed that all radio galaxies have lobes. If the lobe happens to be pointing at us, it appears minimized and we see mostly the core.
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The brakes in a car work because of
a. Archimedes' principle b. Pascal's principle c. Bernoulli's principle d. Torricelli's principle e. none of these principles
Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies, both active and inactive. b. Radio jets are seen from low-mass black holes plus accretion disks inside our galaxy. c. Jets and accretion disks have been observed in active galaxies. d. Black holes can produce so much energy in such a small place. e. All of the other choices are correct.
Buoyancy: A cylindrical rod of length 12 cm and diameter 2.0 cm will just barely float in water of density 1000 kg/m3. What is its mass?
A. 38 g B. 75 g C. 150 g D. 300 g
Can the gravitational force of Earth do positive or negative work on a geosynchronous communication satellite, once it is on its circular orbit?
A. Yes, because centripetal forces always do positive work B. Yes, because its speed is constant C. No, because the satellite has zero acceleration D. No, because the force is always perpendicular to the orbital path