Supernova remnants ________.
A. may contain up to 10 solar masses of material ejected from the star
B. initially expand at thousands of km/s
C. are important for mixing material into the interstellar medium
D. All of these choices are correct.
Answer: D
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Figure R5.10 shows a two-observer space time diagram for an Other Frame that moves at a speed of 0.5 relative to the Home Frame. What are the coordinates of event R in the Other Frame?
A. t? = –1.15 s, x? = 4.0 s
B. t? = 0.9 s, x = 3.4 s
C. t? = 6.5 s, x? = 1.7 s
D. t? = 2.2 s, x? = 3.2 s
E. Other (specify)
A rope pulls on the lower block in the figure with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.16
The coefficient of kinetic friction between the lower block and the upper block is also 0.16. The pulley has no appreciable mass or friction. What is the acceleration of the 2.0 kg block? A) 4.1 m/s2 B) 5.1 m/s2 C) 8.4 m/s2 D) 9.2 m/s2
Rotation curves for spiral galaxies show:
A) they are slowing down. B) rotation speed drops off further from the nucleus. C) most have dark halos. D) most of the mass lies in the nucleus. E) no relation to mass.
The most likely method of interstellar communication is similar to which type of communication on Earth?
A) sign language B) telepathy C) Morse code D) the spoken word