The temperature of an object from which no heat energy can be extracted is
a. 0° F.
b. 0° C.
c. 0 K.
d. 100 K.
e. 100° C.
c
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A light ray bends when it goes from one medium to another because of __________
Fill in the blank(s) with correct word
What is a Cepheid variable?
A) It is a bright source of variable X-ray emission, thought to harbor a supermassive black hole. B) It is a type of very luminous star that makes an excellent standard candle. C) It is a main-sequence star of spectral type B5. D) It is a type of galaxy that varies in its light output.
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
A. straight lines in space that go from one magnetic charge to another. B. straight lines in space that are parallel to the wire. C. straight lines in space that are perpendicular to the wire. D. circles that have their centers on the wire and lie in planes perpendicular to the wire. E. circles that have the wire lying along a diameter of the circle.
As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be
a. slower than the normal speed of sound in air. b. equal to the normal speed of sound in air. c. some constant speed faster than the normal speed of sound in air. d. faster and faster.