How would a compass needle align itself in the magnetic field shown in this figure?
a. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing clockwise.
b. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing counterclockwise.
c. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly at the wire.
d. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly away from the wire.
e. The direction the compass tends to point is up out of the page, but it cannot rotate that way, and it therefore does not respond to the magnetic field.
a
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A long, half-round cylinder is placed in an air stream with its flat face down-stream. An electrical resistance heater inside the cylinder maintains the cylinder surface temperature at 50°C. The cylinder diameter is 5 cm, the air velocity is 31.8 m/s, and the air temperature is 20°C. Determine the power input of the heater per unit length of cylinder. Neglect radiation heat transfer.
GIVEN
• A long, half-round cylinder in an air stream with its flat surface downstream
• Cylinder surface temperature (Ts) = 50°C
• Cylinder diameter (D) = 5 cm = 0.05 m
• Air velocity (U?) = 31.8 m/s
• Air temperature (T?) = 20°C FIND
• Power input to the heater ( Q G/L)
ASSUMPTIONS
• Steady state
• Radiative heat transfer is negligible
• Flow separates at the cylinder edges as shown below
SKETCH
The wavelength of a radio wave from an AM station broadcasting at 1,000 kilohertz on your radio dial is 300 meters
a. True b. False Indicate whether the statement is true or false
Three capacitors of capacitance 6 ?F each are given. The minimum and maximum capacitance, which may be obtained are?
A. 6 ?F, 18 ?F B. 3 ?F, 12 ?F C. 2 ?F, 12 ?F D. 2 ?F, 18 ?F
Interaction partners
A. are equal in magnitude and opposite in direction and act on the same object. B. are equal in magnitude and opposite in direction and act on different objects. C. appear in a free-body diagram for a given object. D. always involve gravitational force as one partner. E. act in the same direction on the same object.