The graphs below show the phasors ?Vmax and Imax for five RLC series circuits. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax. Which graph represents a circuit where the inductive reactance is greater than the capacitive reactance?
A.
B.
C.
D.
E.
Answer: B
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A thermocouple (0.8-mm-OD) is located horizontally in a large enclosure whose walls are at 37°C. The enclosure is filled with a transparent quiescent gas that has the same properties as air. The electromotive force (emf) of the thermocouple indicates a temperature of 230°C. Estimate the true gas temperature if the emissivity of the thermocouple is 0.8.
GIVEN
• Horizontal thermocouple in a large enclosure
• Thermocouple outside diameter (D) = 0.8 mm = 0.0008 m
• Enclosure wall temperature (Te) = 37°C = 310 K
• Gas is enclosure is quiescent and has the same properties as air
• Thermocouple reading (Ttc) = 230°C = 503 K
• Thermocouple emissivity (?) = 0.8
FIND
• True gas temperature (T?)
ASSUMPTIONS
• Enclosure behaves as a black body
• Conduction along the thermocouple out of the enclosure is negligible
SKETCH
PROPERTIES AND CONSTANTS
The Stephan-Boltzmann Constant (?) = 5.67 ?10–8 W/(m2 K4).
Any object moving relative to Earth will have a Doppler shift when viewed from Earth
Indicate whether the statement is true or false
The molecules in a room-temperature glass of water jostle around at
A) various speeds. B) much the same speed. C) constant speeds.
What is the quark structure of an electron?
a. uud b. udd c. uuu d. ddd e. the question does not make sense