Of all the active galactic nuclei, the ________ is the most energetic
A) quasar
B) giant elliptical
C) radio lobe galaxy
D) blazar
E) Seyfert
A
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A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket.
A. 0.40 kg/s B. 0.50 kg/s C. 0.60 kg/s D. 0.70 kg/s E. 0.80 kg/s
Approximately how many neutrinos pass through your body each second?
A) about 1023 B) about a thousand trillion C) about one thousand D) None; they are blocked by the Earth's atmosphere.
The ________ tides have a large change from high to low, near new and full moons
Fill in the blank(s) with correct word
A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
a. 83% b. 65% c. 43% d. 90% e. 56%