It is July and you are in your hometown. As you travel northward toward the north pole, how does the number of daylight hours vary? How does the number of daylight hours vary as you travel southward toward the south pole?
The number of daylight hours increases as you travel northward. As you travel
southward the number of daylight hours decreases.
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) A 100-W lamp glows brighter than a 25-W lamp. The electrical resistance of the 100-W lamp is
A) less. B) greater. C) the same.
The number of technological civilizations in our galaxy is limited by
a. the number of stars in our galaxy. b. the fraction of stars with planets. c. the number of planets per star in habitable zones longer than a few billion years. d. the fraction of suitable planets where technical life forms evolve. e. the number of stars in our galaxy, the fraction of stars with planets, the number of planets per star in habitable zones longer than a few billion years, and the fraction of suitable planets where technical life forms evolve.
When a thin copper wire that is 178 m long is connected between a 1.2-V potential difference, the current through the wire is 2.0 amps. What is the diameter of this wire? The resistivity of copper is 1.72 × 10-8 ? ? m
What will be an ideal response?
Which scenario is portrayed by the graph?
A. A car starts from rest and accelerates. It then travels at a constant velocity before slowing to a stop.
B. A car starts from rest and moves forward. It stops for a while before returning to its starting position.
C. A car travels at a constant velocity, then accelerates for a while, then returns to its initial constant velocity.
