The surface of a protostar radiates energy while its core
A) shrinks and cools.
B) shrinks and maintains a constant temperature.
C) shrinks and heats.
D) expands and cools.
C
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How do we learn about Earth’s core, mantle, and crust?
a. magnetic field studies b. seismic waves c. x-ray imaging d. all of the above e. a and b
A large magnetic flux change through a coil must induce a greater emf in the coil than a small flux change
A) True B) False
Lens-Maker Formula: The radius of curvature of the curved side of a plano-convex lens made of glass, having index of refraction 1.64, is 33 cm. What is the focal length of the lens?
A. 52 cm B. -52 cm C. 21 cm D. -21 cm
Three capacitors of capacitance 6 ?F each are given. The minimum and maximum capacitance, which may be obtained are?
A. 6 ?F, 18 ?F B. 3 ?F, 12 ?F C. 2 ?F, 12 ?F D. 2 ?F, 18 ?F