Why is Titan of interest to astrobiologists?
What will be an ideal response?
Titan's atmosphere is full of methane that can condenses and falls to the surface as rain. Sunlight converts methane (CH4) into the gas ethane (C2H6) plus a collection of other organic molecules. Some of these molecules produce the smog-like haze, and as the smog particles gradually settle, they are predicted to deposit smelly, organic goo on the surface. This goo is important because similar organic molecules may have been the precursors of life on Earth.
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Rotational Dynamics: In a laboratory experiment, a student brings up the rotational speed of a flywheel to 30.0 rpm. She then allows it to slow down on its own, and counts 240 revolutions before the apparatus uniformly comes to a stop. The moment of inertia of the flywheel is 0.0850 kg ? m2. What is the magnitude of the retarding torque on the flywheel?
A. 0.0425 N ? m B. 0.159 N ? m C. 0.0787 N ? m D. 0.000278 N ? m E. 0.0000136 N ? m
Resonance occurs with forced vibration that requires the
A) least amount of energy input. B) maximum amount of energy input. C) matching of wave amplitudes. D) matching of constructive and destructive interference. E) minimum beat frequency.
What is the minimum thickness of a soap bubble film with refractive index 1.38 that results in a constructive interference in the reflected light if this film is illuminated by a beam of light of wavelength 610 nm?
A) 444 nm B) 222 nm C) 555 nm D) 333 nm E) 111 nm
What of these is the largest contributor to the average annual radiation dose? (See Table 25-5 for relevant data.)
a. Exposure during medical procedures. b. Radioactive isotopes of potassium in our bodies. c. Cosmic rays. d. Radon. e. Nuclear power.