Which of the following applications is not suitable for a titanium alloy?
(a) Human body implants
(b) Parts in saltwater, such as a ship propeller
(c) high strength low weight parts
(d) a gas turbine part at 700°C (1292°F)
(d) a gas turbine part at 700°C (1292°F)
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____________________ made very accurate observations of the positions and movements of the planets that were later used to help develop the Rudolphine Tables
Fill in the blank(s) with correct word
A star leaves the main sequence when
A. it stops fusing hydrogen in its core and starts to expand. B. it collapses, and its envelope becomes degenerate. C. nuclear fuel in its core can supply enough energy to stop its collapse. D. it forms planets.
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm
What can we conclude? A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.
As a radio source, the period of "pulsar Earth" is
A) 30 minutes. B) 23 hours, 56 minutes. C) 24 hours. D) 29.5 days. E) 365.25 days.