Why is it important to look closely at the bands of the interior of a meteorite?
What will be an ideal response?
When iron meteorites are sliced open, polished, and etched with acid, they reveal regular bands called Widmanstätten patterns. Those patterns are caused by certain alloys of iron and nickel that formed crystals as the molten metal cooled and solidified long ago. The size and shape of the bands indicate that the molten metal cooled very slowly, no faster than 20 degrees Kelvin per million years. The rate of cooling give scientists clues to the origin of meteorites.
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X-ray and ?-ray NDT detect differences in _________in materials.
Fill in the blank(s) with the appropriate word(s).
How many different kinds of leptons are known to exist, including antiparticles as different kinds?
A) 12 B) 4 C) 2 D) 8 E) 6
A child is riding a merry-go-round that is turning at 7.18 rpm. If the child is standing 4.65 m from the center of the merry-go-round, how fast is the child moving?
A) 5.64 m/s B) 3.50 m/s C) 0.556 m/s D) 1.75 m/s E) 1.80 m/s
Charge of uniform density (20 nC/m2) is distributed over a cylindrical surface (radius = 1.0 cm), and a second coaxial surface (radius = 3.0 cm) carries a uniform charge density of -12 nC/m2 . Determine the magnitude of the electric field at a point 2.0 cm from the symmetry axis of the two surfaces
a. 2.3 kN/C b. 1.1 kN/C c. 1.7 kN/C d. 3.4 kN/C e. 4.5 kN/C