A guitar string is supposed to be played with a fundamental frequency of 880 Hz. If it is determined to have, instead, a fundamental frequency of 882 Hz, by what amount (as a percentage) must the tension in the string be changed in order that the fundamental frequency be restored to 880 Hz?
A. -0.45%
B. +0.45%
C. -0.11%
D. -0.23%
A. -0.45%
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A steel alloy that has an initial carbon concentration of 0.1 weight %carbon is to be case-hardened by packing it in carbon that maintains a surface concentration of 1 weight %carbon at 1000°C. After 11.8 hours the carbon concentration is 0.5 weight % at a depth of 1 mm into the steel. What time is required to obtain a carbon concentration of 0.5 weight %at a depth of 2 mm into the steel?
What will be an ideal response?
What change slowly occurs during the main-sequence lifetime of a star?
A) As hydrogen is used up in the core, the fusion rate decreases and reduces the luminosity. B) It gathers more gas from interstellar space, increasing its mass and hence the luminosity. C) Its core temperature slowly increases, increasing the fusion rate and hence the luminosity. D) As the solar wind blows material into space, the decreasing mass reduces pressure in the core, which in turn reduces the fusion rate and the luminosity.
For the gray opaque surface having the spectral emissivity given in the figure, determine the spectral reflectivity.
What happens when a star exhausts its core hydrogen supply?
A) Its core contracts, but its outer layers expand and the star becomes bigger and brighter. B) It contracts, becoming smaller and dimmer. C) It contracts, becoming hotter and brighter. D) It expands, becoming bigger but dimmer. E) Its core contracts, but its outer layers expand and the star becomes bigger but cooler and therefore remains at the same brightness.