Define "technological civilization" according to Drake
What will be an ideal response?
Drake defined a technological civilization as a species capable of developing the technology to communicate with other species throughout the Galaxy
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The type of EM radiation that has wavelength just a bit longer than that of visible light is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. gamma ray.
Why do you have to take separate measurements for the individual currents through resistors in Procedures 5 and 6?
The light from a distant star is shifted such that the peak of its spectrum, at 620 nm, is shifted to 635 nm. What is its radial velocity relative to Earth?
A. -0.11c B. -0.024c C. -0.15c D. -0.012c
A wheel (radius = 0.25 m) is mounted on a frictionless, horizontal axis. The rotational inertia of the wheel about the axis is 0.040 kg?m2. A light cord wrapped around the wheel supports a 0.50-kg object as shown in the figure. The object is released from rest. What is the magnitude of the acceleration of the 0.50-kg object?
?
?
A. 3.0 m/s2 B. 3.4 m/s2 C. 4.3 m/s2 D. 3.8 m/s2 E. 2.7 m/s2