The high luminosity of a Seyfert galaxy____
a. comes from the halo of the galaxy
b. is distributed through the spiral arms
c. is spread through the central bulge
d. is concentrated in a very small region of the nucleus
e. varies over the course of years
d
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Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone
Indicate whether the statement is true or false
A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
An electron with a speed of 2.0 × 10^6 m/s moves into a uniform electric field of 325 N/C that is parallel to the electron's motion. How long does it take to bring the electron to rest? (me = 9.11 × 10^-31 kg, e = 1.6 × 10^-19 C)
a. 3.5 × 10^-8 s c. 2.3 × 10^-8 s b. 2.3 × 10^-6 s d. 1.2 × 10^-7 s
A closed 2.0-L container holds 3.0 mol of an ideal gas. If 190 J of heat is added, what is the change in internal energy of the system?
a. zero b. 140 J c. 165 J d. 190 J e. 240 J