According to the steady state theory, the universe did not expand
Indicate whether the statement is true or false
F
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When does a protostar become a main-sequence star?
A) when the rate of hydrogen fusion becomes high enough to balance the rate at which the star radiates energy into space B) when a piece of a molecular cloud first begins to contract into a star C) when it becomes luminous enough to emit thermal radiation D) at the instant that the first hydrogen fusion reactions occur in the protostar's core
Imagine that you feed alternating current to an inductor with high inductance and very low resistance. Suppose we slowly increase the frequency of this alternating current while keeping the amplitude ?0 of the applied emf constant. How does the amplitude i0 of the alternating current flowing in the coil change (or does it)?
A. 25,000 B. 4000 C. 2500 D. 40 E. 25 F. Some other result (specify). T. One needs more information to answer.
Two beams of coherent light are shining on the same piece of white paper. With respect to the crests and troughs of such waves, darkness will occur on the paper where:
a. the crest from one wave overlaps with the crest from the other. b. the crest from one wave overlaps with the trough from the other. c. the troughs from both waves overlap. d. darkness cannot occur as the two waves are coherent.
A long solenoid with closely spaced turns carries electric current. Each turn of wire exerts:
1.an attractive force on the next adjacent turn. 2.a repulsive force on the next adjacent turn. 3.zero force on the next adjacent turn. 4.either an attractive or a repulsive force on the next turn, depending on the direction of current in the solenoid.