As Earth rotates, circumpolar stars appear to move counterclockwise around the north celestial pole
a. True
b. False
Indicate whether the statement is true or false
True
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Which is the most massive star?
A. Star of 0.5 solar masses B. Coolest possible main sequence star C. Type B main sequence star D. Type G main sequence star E. Hottest possible main sequence star
A refrigerator absorbs energy of magnitude |QC | as heat from a low temperature reservoir and transfers energy of magnitude |QH| as heat to a high temperature reservoir. Work W is done on the working substance. The coefficient of performance is given by:
A. |QC |/W B. |QH|/W C. (|QC | + |QH|)/W D. W/|QC | E. W/|QH|
Classify the following statement as a characteristic
(a) of electric forces only, (b) of magnetic forces only, (c) of both electric and magnetic forces, or (d) of neither electric nor magnetic forces. The force exerted on a negatively charged object is opposite in direction to the force on a positive charge.
1.electric forces 2.magnetic forces 3.both electric and magnetic forces 4.neither electric nor magnetic forcesThe "Cambrian explosion" refers to the
A) great many meteorite bombardments that occurred during that time. B) great diversity of life that blossomed during that time. C) evolution and great diversity of blastoids during that time period. D) numerous volcanic eruptions that took place during that time.