What technology do astronomers use to search for extraterrestrial life?

a. space observatories
b. radio telescopes
c. refracting telescopes
d. reflecting telescopes
e. FM radio and televisions


b

Physics & Space Science

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If Star A is closer to us than Star B, then Star A's parallax angle is ________

A) fewer parsecs than that of Star B B) hotter than that of Star B C) smaller than that of Star B D) larger than that of Star B

Physics & Space Science

Which of the following materials is not cross-linked?

(a) Rubber (b) Epoxy (c) UHMWPE (d) Polyester

Physics & Space Science

You want to swim straight across a river that is wide. You find that you can do this if you swim at an angle of ? = 28° from the upstream direction at a constant rate of relative to the water

At what rate does the river flow? The angle ? is measured from the river bank (directly upstream is while directly across the river is A) 1.3 m/s B) 0.70 m/s C) 1.6 m/s D) 1.8 m/s

Physics & Space Science

The inductance of a tuning circuit of an AM radio is 4.00 mH. Find the capacitance of the circuit required for reception at 1200 kHz.

A. 2.10 pF B. 4.40 pF C. 21.2 pF D. 43.4 pF E. 27.6 pF

Physics & Space Science