The light-collecting area of an 8-meter telescope is ________ times that of a 2-meter telescope.
A) 16
B) 4
C) 8
D) 6
A) 16
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A object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 0.25 cm B) 15 cm C) 4.0 cm D) 2.4 cm E) 1.3 cm
In a 2-dimensional Cartesian system, the y component of a vector is known, and the angle between vector and x axis is known. Which operation is used to calculate the magnitude of the vector (taken with respect to the y component)?
a. dividing by cosine c. multiplying by cosine b. dividing by sine d. multiplying by sine
If an iron-0.77 % C steel is very rapidly cooled from 800°C to room temperature, the expected microstructure is described as _____________.
Fill in the blank(s) with the appropriate word(s).
Inflation explains the horizon and flatness problems
a. True b. False Indicate whether the statement is true or false