Brown dwarfs are
A. objects massive enough to fuse deuterium but not massive enough to sustain hydrogen fusion.
B. large terrestrial planets.
C. very low-mass main sequence stars.
D. what is left over after a massive star ejects most of its material through a supernova.
Answer: A
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What methodology do astronomers use to map the inside of the Sun?
a. coronagraphy b. magnetic field mapping c. helioseismology d. chromography e. heliogeology
The heat transfer rate from hot air by convection at 100°C flowing over one side of a flat plate with dimensions 0.1-m by 0.5-m is determined to be 125 W when the surface of the plate is kept at 30°C. What is the average convective heat transfer coefficient between the plate and the air?
GIVEN
• Flat plate, 0.1-m by 0.5-m, with hot air flowing over it
• Temperature of plate surface (Ts) = 30°C
• Air temperature (T?) = 100°C
• Rate of heat transfer (q) = 125 W
FIND
• The average convective heat transfer coefficient, hc, between the plate and the air
ASSUMPTION
• Steady state conditions exist
SKETCH
Exhibit 12-2
The figure below shows a graph of angular velocity versus time for a man bicycling around a circular track.
?
?
Use this exhibit to answer the following question(s).
Refer to Exhibit 12-2. What is his average angular acceleration, in rad/s2, in the first 10 minutes?
A.
B.
C.
D.
E.
A series LRC circuit has a 100-? resistor, a 0.100-?F capacitor and a 2.00-mH inductor connected across a 120-V rms ac voltage source operating at (1000/?) Hz. What is the resonant frequency of this circuit?
A) 70.7 kHz B) 17.9 kHz C) 22.5 kHz D) 35.3 kHz E) 11.3 kHz