Which of the following areas have the most massive black holes (those with the highest masses)?
A. where a massive star has died
B. in spiral galaxy halos
C. in the outer halos of elliptical galaxies
D. in X-ray binary stars
E. in the centers of spiral galaxies
Ans: E. in the centers of spiral galaxies
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Which kind of active galaxies has been observed at the greatest distances from us?
a. Seyfert galaxies b. radio galaxies c. quasars
Answer the following statement(s) true (T) or false (F)
1. The frequencies of the normal modes of a string that is free at both ends are the same as those of a string that is fixed at both ends
All except one of the following require the application of a net force. Which one is the exception?
A. Changing an object from a state of rest to a state of motion B. Maintaining an object in uniform circular motion C. Changing an object's speed without changing its direction of motion D. Changing an object's direction of motion without changing its speed E. Maintaining an object in motion at a constant velocity
Q1 has 50 electric field lines radiating outward and Q2 has 250 field lines converging inward. What is the ratio Q1/Q2?
a. 5 b. ?5 c. 1/5 d. ?1/5 e. 0