Aluminum alloys must be welded in an inert atmosphere because of the formation of aluminum _________if welding is performed in air.
Fill in the blank(s) with the appropriate word(s).
oxide
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A lunar eclipse that occurs when the moon moves completely into Earth's umbral shadow is called
a. a total solar eclipse. b. a partial solar eclipse. c. an annular solar eclipse. d. a penumbral lunar eclipse. e. an umbral lunar eclipse.
The oxygen in Earth's atmosphere
a. was manufactured inside stars. b. was added to the atmosphere by plant life. c. has grown more abundant since the origin of Earth. d. was manufactured inside stars, was added to the atmosphere by plant life, and has grown more abundant since the origin of Earth. e. None of the other choices are correct.
Energy and Momentum: On a frictionless horizontal surface, a 1.50-kg mass traveling at 3.50 m/s suddenly collides with and sticks to a 3.00-kg mass that is initially at rest, as shown in the figure. This system then runs into an ideal spring of force constant (spring constant) 50.0 N/cm.(a) What will be the maximum compression distance of the spring?(b) How much mechanical energy is lost during this process? During which parts of the process (the collision and compression of the spring) is this energy lost?
What will be an ideal response?
The dustiest and flattest spiral galaxies are in Hubble's class
A) Sc. B) Sa. C) SBa. D) S0. E) SBc.