If a two-dimensional universe has a negative curvature,
a. the area of a circle will be greater than ?r2.
b. the area of a circle will be equal to ?r2.
c. the universe is infinite.
d. the universe is finite but bounded.
e. the universe will have a center.
C
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Which of the following systems cannot be analyzed as a visual binary?
A) Binary stars that are separately visible in a telescope B) Binary stars that are about 2 AU apart C) Binary star systems having orbital periods of hundreds or thousands of years D) Binary stars orbiting so close to each other that they are not visible as separate stars
The main lens or mirror of a telescope is called the ____________________
Fill in the blank(s) with correct word
What is the focal length of a magnifying glass that produces an angular magnification of 7.0 x when used by a person with a near point at 28 cm?
A) 2.0 cm B) 3.0 cm C) 4.0 cm D) 5.0 cm E) 6.0 cm
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A b. 89 A c. 61 A d. 75 A e. 37 A