Between us and the Galactic Center, the Milky Way has a mass of:
A) several hundred thousand suns.
B) one to two million suns.
C) 250 million suns.
D) 100 billion suns.
E) over a trillion suns.
D
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What is a Starburst Galaxy?
A.) A galaxy whose spiral arms have been stretched out into a star-like shape. B.) A galaxy with a supermassive black hole at the center. C.) A galaxy with a very high rate of star formation. D.) A galaxy with multiple supernovae. E.) A galaxy with a lot of gamma-ray emission.
Significant amounts of liquid water last existed on the surface of Mars during the
A) Noachian Era B) Amazonian Era C) Hadean Era D) Hesperian Era
A helium nucleus (charge = 2e, mass = 6.63 × 10^-27 kg) traveling at 6.20 × 10^5 m/s enters an electric field, traveling from point A, at a potential of 1.50 × 10^3 V, to point B, at 4.00 × 10^3 V. What is its speed at point B?
1.7.91 × 10^5 m/s 2.3.78 × 10^5 m/s 3.2.13 × 10^5 m/s 4.2.52 × 10^6 m/s 5.3.01 × 10^8 m/s
In a section of horizontal pipe with a diameter of 3.00 cm the pressure is 5.21 kPa and water is flowing with a speed of 1.50 m/s. The pipe narrows to 2.50 cm. What is the pressure in the narrower region?
A) 4.00 kPa B) 7.50 kPa C) 5.82 kPa D) 6.42 kPa E) 4.61 kPa