Galaxies are aggregations of stars, stellar dust, and gas. Their masses
A) are all about the same, which is huge.
B) vary greatly from one galaxy to the next.
C) are small compared to blue supergiant stars.
D) depend on the rate of pulsar emissions within them.
Answer: B
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Intensity: A radio transmitter is operating at an average power of 4.00 kW and is radiating uniformly in all directions. What is the average intensity of the signal 8.00 km from the transmitter?
A. 4.97 ?W/m2 B. 2.49 ?W/m2 C. 0.00497 W/m2 D. 0.00249 W/m2
Answer the following statement(s) true (T) or false (F)
1. In figure R2.12, the object whose world line is labelled B is moving along the x axis. 2. Coordinate time would be frame-independent if the Newtonian concept of time were valid. Consider a Home Frame and an Other Frame that moves in the +x direction with respect to the Home Frame. 3. Observers in the Home Frame will conclude that the clocks in an Other Frame will be out of synchronization, even if the observers in the Other Frame have carefully synchronized clocks using the Einstein prescription.
The number of Type I and Type II supernovae observed are approximately equal
Indicate whether the statement is true or false
The dilemma known as the ultraviolet catastrophe was resolved in 1900 by
a. Bohr. b. Rutherford. c. Einstein. d. Planck.