Refer to the H-R diagram above that shows the life track of a 1-solar-mass star, with various stages labeled with Roman numerals. A star at the point labelled iii is
A) a protostar.
B) on the main sequence.
C) a red giant.
D) experiencing shell fusion.
B) on the main sequence.
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Why do we think Mars had more volcanic activity in the past than it does today?
a. Mars was bombarded with more impacts in the past, which fueled more volcanic activity. b. Mars’ interior would have been warmer in the past. c. Some meteorites from Mars come from relatively young lava. d. All of the above. e. b and c.
A current of 4.0 A is maintained in a single circular loop having a circumference of 80 cm. An external magnetic field of 2.0 T is directed so that the angle between the field and the plane of the loop is 20°. Determine the magnitude of the torque exerted on the loop by the magnetic forces acting upon it
a. 0.41 N / m b. 0.14 N / m c. 0.38 N / m d. 0.27 N / m e. 0.77 N / m
In the UNS system of material designations, if an alloy designation starts with a “G”, it is a plain-carbon or low-alloy _________.
Fill in the blank(s) with the appropriate word(s).
Laboratory experiments conducted with particle accelerators confirm predictions made by the theory that unifies ________
A) the strong, weak, and electromagnetic forces into the GUT force B) the electromagnetic and weak forces into the electroweak force C) the unification of all four forces into a single "superforce" D) the strong and weak forces into the combined nuclear force