Eratosthenes first learned about the position of the Sun in mid-summer by
A) consulting library information.
B) setting up a stick at Syene.
C) setting up a stick at Alexandria.
D) setting up sticks at both Syene and Alexandria.
E) none of the above
Answer: A
You might also like to view...
Volcanic activity is associated with
A) divergent, convergent, and transform boundaries. B) convergent and transform boundaries. C) divergent and convergent boundaries. D) divergent, convergent, and plate tectonic boundaries.
Motional Emf: As shown in the figure, a metal bar is in contact with a pair of parallel rails and is in motion with an upward velocity of magnitude ?. A uniform magnetic field is present, directed downward as shown. The direction of the induced current through the resistor R is
A. from a to b. B. from b to a. C. No current is induced.
The maximum magnification of a typical light optical microscope is
(a) 100,000 times (b) 10,000 times (c) 1000 times (d) 100 times
We can essentially rule out the Sun as a cause of global warming over the past few decades because
A) the amount of incoming sunlight has decreased while Earth's average temperature has increased. B) the amount of light coming from the Sun does not change over time scales of decades. C) there is no evidence that the Sun can affect climate. D) the number of sunspots on the Sun varies in an approximately 11-year cycle.