Which is NOT true?
A. A star that appears brighter than another is always closer.
B. A blue Main Sequence star has a higher luminosity than a red main sequence star
C. More massive Main Sequence stars are always both hotter and brighter than less massive Main Sequence stars
D. A B-type Main Sequence star that appears 100 times brighter than another B type Main Sequence star is 10 times closer
E. The spectrum of a star allows us to estimate its temperature
Ans: A. A star that appears brighter than another is always closer.
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A. 0.460c B. 0.487c C. 0.492c D. 0.550c E. 0.660c
A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J. The efficiency of the jack system is at most
A) 10%. B) 20%. C) 50%. D) 80%. E) not enough information
The maximum temperature on the Kelvin scale is called ________.
A. gamma temperature B. absolute energy C. the vapor point D. absolute zero E. There is no maximum temperature on the Kelvin scale.
Assume that all the circuit elements have the same resistance. (b) Which bulb is (or bulbs are) dimmest? (To indicate a pair of bulbs using the letters at the back of the book, point to two letters at the same time.)
A. Bulb A
B. Bulb B
C. Bulb C
D. All three bulbs are equally bright.