At time D, is the expansion of the universe accelerating, coasting, or decelerating?
What will be an ideal response?
Decelerating
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A DC current of size 10 A flows through one coil of a transformer. What is the current flowing through the other coil of the transformer if that second coil has ten times as many loops as the first?
a. 0 A b. 1.0 A c. 10 A d. 100 A e. 1000 A
Electric field lines symbolize
A. The force a positive charge would experience at the location of the line B. The path a positive charge would take if released at rest on one of the lines C. The distribution of electric charges in space D. Boundaries between regions of positive and negative charge
A ___________ has a few million light-sensitive diodes in an array typically about a half-inch square
a. photometer b. charge-coupled device c. spectrograph d. photographic plate e. grating
The choices describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar system.)
A) Size: same as the Moon Distance from Sun: same as Mars Rotation rate: once every 10 days B) Size: twice as big as Earth Distance from Sun: same as Mercury Rotation rate: once every 6 months C) Size: same as Mars Distance from Sun: same as Earth Rotation rate: once every 18 hours D) Size: same as Venus Distance from Sun: same as Mars Rotation rate: once every 25 hours