Io is the most geologically active object in our Solar System
a. True
b. False
Indicate whether the statement is true or false
True
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In principle, the Drake equation should enable us to calculate the exact number of intelligent civilizations capable of interstellar communication in our galaxy right now. However, currently this is not feasible because
A) we do not have exact numbers for any of the factors in the equation B) it is impossible for us to ever know the values of any of the factors C) we have exact numbers for the first three factors, but not the last factor D) we have an exact number for the first factor, but not for any of the other factors
An object is 12 cm in front of a concave spherical mirror, and the image is 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 0.25 cm B) 15 cm C) 4.0 cm D) 2.4 cm E) 1.3 cm
A nuclear reactor fuel rod is a circular cylinder 6 cm in diameter. The rod is to be tested by cooling it with a flow of sodium at 205°C and a velocity of 5 cm/s perpendicular to its axis. If the rod surface is not to exceed 300°C, estimate the maximum allowable power dissipation in the rod.
GIVEN
• Cylinder in a cross flow of liquid sodium
• Cylinder diameter (D) = 6 cm = 0.06 m
• Sodium temperature (T?) = 205°C
• Sodium velocity (U?) = 5 cm/s = 0.05 m/s
• Maximum rod surface temperature (Ts) = 300°C FIND
• The maximum allowable power dissipation Gq
ASSUMPTIONS
• Steady state
• Turbulence in the sodium flow approaching the rod is low
• Heat generation per unit volume in the rod is uniform
SKETCH
The absence of folded mountain ranges on Mars suggests that it has been subjected to plate tectonics
Indicate whether the statement is true or false