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.
E
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What process do scientists use to determine how nature works?
a. The observational method b. The scientific method c. The brainstorming method d. The laboratory method e. The naturalistic method
How would you treat a radiation heat transfer boundary condition for a one-dimensional steady problem? Develop the difference equation for a control volume near the boundary and explain how to solve the entire system of difference equations. Assume that the heat flux at the surface is q = ? ? (Ts4 – Te4) where Ts is the surface temperature and Te is the temperature of an enclosure surrounding the surface.
GIVEN
• Radiation boundary condition
• One-dimensional steady conduction
FIND
(a) Difference equation for control volume near surface (b) Solution method
SKETCH
Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer, a. sees the lights flash simultaneously in his coordinate system. b. sees the bow (front) light flash before the aft (rear) light. c. sees the aft (rear) light flash before the bow(front light. d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
Why might the presence of a giant planet be both good and bad for life on a terrestrial planet in another solar system?
What will be an ideal response?