What is the specific surface of a heat exchanger?
What will be an ideal response?
The specific surface of a heat exchanger is the ratio of the heat exchanger
surface area to the volume of the heat exchanger. The units of the specific
surface are invers length, such as m^-1, or ft^-1.
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Protoplanets
a. grew in size primarily by accretion. b. grew in size primarily by condensation. c. are still visible today as the terrestrial planets. d. grew in size by collecting the particles in the solar wind. e. grew in size by the collision and coalescing of planetesimals.
Which of the following could not be determined by an observation that only uses spectroscopy?
A) the chemical composition of a distant star B) the speed at which a distant galaxy is moving away from us C) the surface temperature of a distant star D) the rotation rate of a distant star E) the angular size of a distant galaxy
What would probably be the most likely source of energy for life in Jovian atmospheres?
A) sunlight B) chemical reactions powered by lightning C) meteoroid impacts D) solar wind particles from the Sun
Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.