The iron we commonly find in our surroundings came from:
A) the iron core of a massive star which exploded as a type I supernova.
B) planetary nebulae.
C) jets ejected by a rapidly spinning pulsar.
D) material ejected by a nova explosion.
E) decay of nickel 56 and cobalt 56 in a supernova remnant.
E
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Which casting technique is appropriate for a very complex metal shape that cannot be removed from a mold?
(a) Sand mold (b) Permanent mold (c) Die (d) Investment
A projectile is projected from the origin with a velocity of 25.0 m/s at an angle of 45.0 degrees above the horizontal. What is the time it takes for the projectile to hit the ground?
A. 1.95 s B. 2.22 s C. 2.75 s D. 3.04 s E. 3.61 s
We can measure stellar parallax for most stars in our galaxy
Indicate whether the statement is true or false
In partially stabilized zirconia, particles of the tetragonal phase transform to the _________phase at the crack tip when subject to a sufficient stress.
Fill in the blank(s) with the appropriate word(s).