Absolute visual magnitude is the:
A) apparent magnitude of a star observed from Earth.
B) luminosity of a star observed from a distance of 1000 pc.
C) apparent magnitude of a star observed from a distance of 10 pc.
D) luminosity of a star observed from Earth.
C
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A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle. How much work does it perform in each cycle?
A. zero B. 52.5 J C. 97.5 J D. 150 J
The deuterium and lithium-7 in distant quasars and in the interstellar medium suggests that the Universe is open
a. True b. False Indicate whether the statement is true or false
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
Given that 
and 
, what is 
?
A.
B.
C.
D.
E.
The direction of the magnetic field of a bar magnet is
a. in the direction a compass would point. b. in any direction. c. away from the south pole. d. toward the north pole.