Which of the following is true of quasars?
A) They manifest very small redshifts.
B) Their spectra are similar to stellar spectra.
C) They represent the structure of galaxies as they are in the present time.
D) Their luminosity is 10 to 1000 times the luminosity of a large galaxy.
D
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____________________ discovered Uranus using a telescope that he built himself
Fill in the blank(s) with correct word
A 2200 kg truck is decelerated from 22 m/s to 12 m/s in 3.2 s, as its driver sees a deer wander into the road. What was the magnitude of the net force that slowed the truck?
A. 8.3 kN B. 23.4 kN C. 6.9 kN D. 15.1 kN
In the difference A - B - C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the difference?
A) 2 B) 3 C) 4 D) 5 E) 0
A spaceship is observed from the Earth to be moving toward a star at a speed of 0.80 c. If the distance from the spaceship to the star is 1.6 ly as measured from earth, how long does an observer on Earth find that it takes for the space ship to reach the star?
A. 2.0 y B. 2.1 y C. 1.6 y D. 1.2 y E. 0.96 y