In a binary system, the more massive star
a. is at the center of mass.
b. is farthest from the center of mass.
c. is nearest the center of mass.
d. follows the largest orbit.
e. shows a larger Doppler shift in its spectral lines.
c
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A parallel-plate capacitor has plates of area 0.40 m2 and plate separation of 0.20 mm. The capacitor is connected across a 9.0-V potential source. (?0 = 8.85 × 10-12 C2/N • m2)
(a) What is the magnitude of the electric field between the plates? (b) What is the capacitance of the capacitor? (c) What is the magnitude of the charge on each plate of the capacitor?
When the distance between two charges is halved, the electric force between the charges
A) quadruples. B) doubles. C) is half. D) is reduced by one-quarter. E) none of the above
A long wooden rod at 38°C with a 2.5 cm OD is placed into an airstream at 600°C. The heat transfer coefficient between the rod and air is 28.4 W/(m2 K). If the ignition temperature of the wood is 427°C, ? = 800 kg/m3, k = 0.173 W/(m K), and c = 2500 J/(kg K), determine the time between initial exposure and ignition of the wood.
GIVEN
• A long wooden rod is placed into an airstream
• Rod outside diameter (D) = 2.5 cm = 0.025 m
• Initial temperature of the rod (To) = 38°C
• Temperature of the airstream (T?) = 816°C
• The heat transfer coefficient (hc) = 28.4 W/(m2 K)
• The ignition temperature of the wood (TI) = 427°C
• Density of the rod (?) = 800 kg/m3
• Thermal conductivity (k) = 0.173 W/(m K)
• Specific heat (c) = 2500 J/(kg K)
FIND
• The time between initial exposure and ignition of the wood
SKETCH
We know that the Schrödinger equation is specifically an equation for EEFs because
A. Quantons quickly settle down into EEFs. B. A bound quanton can only exist in an EEF. C. We derived it assuming that E had a definite value. D. It is a generalization of the de Broglie relation. E. Some other reason (specify).