The sketch shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence, while (c) and (d) represent only small parts of the main sequence. Which group represents stars of the largest radii?
A) a
B) b
C) c
D) d
E) e
E) e
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Which one of the following statements concerning emf is true?
a) Emf is the work done in moving the current from one terminal to the other of an emf device. b) Emf is the work done in moving a single charge from one terminal to the other of an emf device. c) Emf is the force exerted on a single charge to move it from one terminal to the other of an emf device. d) Emf is the total charge moving from one terminal to the other of an emf device. e) Emf is the electromagnetic force that is exerted between the terminals of an emf device.
If sufficient force is applied to a crystal, it can be permanently deformed. Permanent deformation in metal crystals occurs due to atomic displacements on the planes that are most closely packed, and it happens in the most closely packed directions. Assume that a force is applied to a crystal of FCC copper that permanently stretches the crystal in the [001] direction. The (111) plane is one of the close-packed planes in FCC copper on which permanent deformation could occur.
(a) What is the angle between the [001] direction and the normal to the (111) plane? (b) Atom displacements along which close-packed directions within the (111) plane could contribute to the permanent deformation of the crystal in the [001] direction?
The carbon-nitrogen-oxygen (CNO) cycle works best in temperatures:
A) lower than 10,000,000 K. B) higher than 16,000,000 K. C) higher than 11,000,000 K but lower than 12,000,000 K D) higher than 13,000,000 K but lower than 15,000,000 K
The gravitational force between two objects can be described using the equation Fg = G M1 M2 / d2. According to this equation, if the distance between two objects increases, what happens to the gravitational force between them?
A) The force increases. B) The force decreases. C) The force drops instantly to zero. D) The gravitational force is not affected by distance.