If all of the mass in the galaxy were concentrated at its center, then orbital velocity would be high near the center and would decline away from the center
Indicate whether the statement is true or false
True
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___________ in other galaxies should contain luminous O and B stars if they are like the Milky Way
a. The halos b. The bulges c. The spiral arms d. The globular clusters e. The coronas
How many special rays are used in ray tracing to find the image of a lens?
A. 2 B. 3 C. 4 D. 5
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m ? K), separates a basement at 18°C from the ground outside at 6°C. Under steady state conditions, how much heat flows through the wall in one hour?
A) 1.8 MJ B) 1.8 kJ C) 500 J D) 5.0 MJ E) 5.0 kJ
You find yourself in a maelstrom, whipped by winds gusting at 10,000 km/hr, rising and falling in convective currents
On the rare occasions when you can assess your surroundings, you notice a horizon that seems to go on "forever" (or, at least, much farther than the horizon on Earth), and no solid surface anywhere. You get a glimpse of several large moons. The Sun races through your sky, requiring only about 5 hours to rise nearly due east, cross the meridian at an altitude of about 55° in the north, and then set due west.