A saturated hydrocarbon that is made up of eight
carbon atoms and eighteen hydrogen atoms is
named
a) octane.
b) butane.
c) methane.
d) ethane.
a
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A very light 1.00-m wire consists of two segments of equal length, one of steel (Young's modulus is 2.00 × 1011 N/m2 )
and one of brass (Young's modulus is 9.0 × 1010 N/m2 ). The steel segment is 1.50 mm in diameter, and the brass segment has twice this diameter. When a weight w is hung from the ceiling by this wire, the steel segment stretches by 1.10 mm. Find the weight w. A) 190 N B) 390 N C) 780 N D) 1000 N E) 3100 N
The emission of a line from the Balmer series is followed almost immediately by the emission of a line from the Lyman series. This will be true for
a. only the first line of the Balmer series and the first line of the Lyman series. b. all the lines of the Balmer series followed by only the first line of the Lyman series. c. only the first line of the Balmer series followed by any of the lines of the Lyman series. d. all the lines of the Balmer series followed by any of the lines of the Lyman series.
Consider an RLC circuit. The impedance of the circuit increases if XL increases
A) always true B) never true C) true only if XL is greater than or equal to XC D) true only if XL is less than or equal to XC
The arrow in the photo on the left points to the location of the star that has exploded as a supernova in the photo on the right. From this photo pair alone, what can we conclude about the star that exploded? (Assume that we know the star was not a member of a binary system.)
A) It was a high-mass star with at least 8 times the mass of the Sun. B) It is now a black hole. C) It was a red giant star. D) Before the supernova, the star lived for at least a billion years.