The stellar spectral sequence, in order of decreasing temperature, is
A) OBAFGKM. B) OFBAGKM. C) OBAGFKM. D) ABFGKMO. E) BAGFKMO.
A
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The interstate on-ramp is 1.5 km West of your home, and on leaving for grandmother’s house you are only able to accomplish an average velocity of 12 km/hr between your home and the on-ramp. At the onramp, you wait for traffic, for 2.0 min – and then are able to proceed toward grandmother’s house. If you wish to arrive there, which is 15 km South of the onramp, over a river and through some woods, in a total elapsed time of 25.0 minutes, what average speed must you maintain on the interstate highway?
A. 51 km/hr B. 67 km/hr C. 36 km/hr D. none of these.
The Sun will exhaust its nuclear fuel in about
A) 5000 AD. B) 5 million years. C) 5 billion years. D) 50 billion years.
When material expanding away from a star in a binary system leaves a star’s Roche lobe,
a. the material will start to fall back toward the star.
b. all of the material will accrete on to the companion.
c. the material is no longer gravitationally bound to that star.
d. the material will increase in temperature an eventually undergo thermonuclear fusion.
e. c and d.
The laws of physics are the same in all inertial frames of reference
Indicate whether the statement is true or false