You measure the parallax angle for a star to be 0.5 arcseconds. The distance to this star is
A) 0.5 light-year.
B) 2 parsecs.
C) 5 light-years.
D) 0.5 parsec.
E) 5 parsecs.
B
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What did the International Astronomical Union classify Pluto as in 2006?
a. asteroid b. comet c. planet d. dwarf planet e. meteor
The time before the Phanerozoic eon is collectively called ______________ time
Fill in the blank(s) with correct word
A person is dragging a packing crate of mass 100 kg across a rough horizontal floor where the coefficient of kinetic friction is 0.400. He exerts a force F sufficient to accelerate the crate forward
At what angle above horizontal should his pulling force be directed in order to achieve the maximum acceleration? A) 21.8° B) 27.7° C) 30° D) 34.5° E) 45°
The size of the electric current in an electrical conductor is a function of which of the following?
a. velocity of charge carriers b. conductor cross-sectional area c. density of charge carriers d. All of the above choices are valid.