In the UNS system of material designations, if an alloy designation starts with a “G”, it is a plain-carbon or low-alloy _________.
Fill in the blank(s) with the appropriate word(s).
steel
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The Crab Pulsar has a period of length 33.085 ms. It is estimated to have an equatorial radius of 15 km, about average for a neutron star. What is the value of the centripetal acceleration of an object on the surface at the equator of the pulsar?
a. 
b. 
c. 
d. 
Since it was first predicted in the 1970s, scientists have observed the evaporation of about a dozen black holes
Indicate whether the statement is true or false
When an object is placed 118 cm from a thin diverging lens, its image is found to be 59 cm from the lens. The lens is removed, and replaced by a thin converging lens whose focal length has the same magnitude as the diverging lens
This second lens is at the original position of the first lens. Where is the image of the object now?
Why did Tycho conclude that the Sun revolves around the Earth?
A) He did not conclude that the Sun revolves around the Earth. B) He could not detect the parallax of stars expected if the Earth revolves around the Sun. C) He incorrectly measured the distance to the Sun and concluded it was in a low orbit around the Earth. D) Long-held tradition prevented him from even considering the idea.