At last, someplace fairly comfortable. Very weak gravity is holding you to the surface of the small object on which you sit. Your object is apparently moving away from a star, perhaps one that it orbits with a period of thousands of years
Around you, geysers are spouting gas into space. Looking back along the object's orbit, you see particles of dust that the geysers apparently blew off the object when it was nearer to the star that it is now leaving behind. You conclude that the geysers were recently much more active but are now settling down into a quiescent state that may last for millennia. You also soon realize that you are closer to home than you have been in all your previous journeys. Perhaps if you can somehow find a small rocket, a heat shield, and a good parachute, you can escape and head home for your final exam. Where are you? A) You are on an asteroid near the center of a galaxy, heading in toward a massive black hole.
B) You have been shrunk in size and are riding a grain of interstellar dust that is carrying you on an orbit about our very own Sun.
C) You are riding a jet of gas from a quasar that is headed in the direction of an ordinary star.
D) You are on comet Hale-Bopp, circa May 1997.
E) You are at Disneyland on the Moon, riding the new "wild and wet" roller coaster.
D
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What is the temperature increase of 3.00 kg of water when heated by a 900-W immersion heater for 9.00 min? (cw = 4 186 J/kg/°C)
a. 77.4°C b. 48.4°C c. 38.7°C d. 19.4°C e. 0.645°C
Which of the following is usually burned up in Earth's atmosphere?
a. Asteroid b. Meteoroid c. Meteor d. Meteorite
Hydrostatic equilibrium refers to the balance between weight and pressure
Indicate whether the statement is true or false
Calculate the maximum safe heat flux in the nucleate-boiling regime for water flowing at a velocity of 15 m/s through a 1.2-cm-ID tube 0.31-m-long if the water enters at 100 kPa pressure and 100°C saturated liquid.
GIVEN
? Nucleate boiling of water flowing through a tube
? Water velocity (V) = 15 m/s
? Tube inside diameter (D) = 1.2 cm = 0.012 m
? Tube length (L) = 0.31 m
? Water pressure (p) = 1 atm
? Water temperature (Tw) = 100°C
FIND
? The maximum safe heat flux in the nucleate boiling regime (q?max)
ASSUMPTIONS
? Steady state
SKETCH
PROPERTIES AND CONSTANTS
From Appendix 2, Table 13, for water at 100°C, 1 atm
From Appendix 2, Table 35, for steam at 100°C: ?v = 0.5977 kg/m3
From Table 9.2: Surface tension at 100°C (s) = 0.0589 N/m
From Table 9.1: For water on copper, Csf = 0.0130