If you hold a light tissue in your hands and gently blow across its top, the tissue will rise slightly because
A. collisions of the moving air with the tissue cause it to rise.
B. the pressure of moving air is less than that of static air.
C. according to Archimedes' Principle, moving air exerts more buoyant force.
D. blowing across the tissue removes all of the air, and then the air below the tissue pushes the tissue up.
Answer: B
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The hypernova model of the collapse of the core of a massive star may describe
A. the gravitational collapse of a protostar prior to the main sequence phase B. the feeding of material into a quasar C. a neutron star D. a relatively long gamma ray burst E. a black hole
Why do pulsars "pulse"?
A. Their surface expands and contracts rapidly, causing changes in brightness. B. They have extremely fast rotation rates. C. Their rotation axis is misaligned with their magnetic field axis. D. They have extremely strong magnetic fields.
The key ingredient in planetary formation in the solar nebula is ________
Fill in the blank(s) with correct word
The Moon and the crustal rocks of Earth are similar in density
Indicate whether the statement is true or false