Simon (Ref. 24) says "(W)e would be able to go on increasing our population forever." Could his statement have been made in earnest? Why or why not?
What will be an ideal response?
Simon apparently did believe this to be a true statement. However, he confounds
physical limits with those artificial limits of human beings. Indefinite population growth is
not sustainable. In a relatively few doubling times, human beings could constitute as much
mass as out Milky Way galaxy. Then what, Prof. Simon?
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The first observations of objects in the solar system that orbited neither the sun nor Earth were made by ____________________
Fill in the blank(s) with correct word
The speed of a 4.0-kg object is given by v = (2t) m/s, where t is in s. At what rate is the resultant force on this object doing work at t = 1 s?
a. 48 W b. 40 W c. 32 W d. 56 W e. 16 W
A thermocouple (0.8-mm-OD wire) used to measure the temperature of quiescent gas in a furnace gives a reading of 165°C. It is known, however, that the rate of radiant heat flow per meter length from the hotter furnace walls to the thermocouple wire is 1.1 W/m and the convective heat transfer coefficient between the wire and the gas is 6.8 W/(m2K). With this information, estimate the true gas temperature. State your assumptions and indicate the equations used.
GIVEN
• Thermocouple (0.8 mm OD wire) in a furnace
• Thermocouple reading (Tp) = 165°C
• Radiant heat transfer to the wire (qr/L) = 1.1 W/m
• Heat transfer coefficient ( ch ) = 6.8 W/(m2 K)
FIND
• Estimate the true gas temperature (TG)
ASSUMPTIONS
• The system is in equilibrium
• Conduction along the thermocouple is negligible
• Conduction between the thermocouple and the furnace wall is negligible
SKETCH
The apparent magnitude of a star tells us how bright the star would appear if placed at a distance of 10 pc from the Sun.
Answer the following statement true (T) or false (F)