A long hollow cylindrical conductor (inner radius = 2.0 mm, outer radius = 4.0 mm) carries a current of 24 A distributed uniformly across its cross section. A long wire which is coaxial with the cylinder carries an equal current in the opposite direction. What is the magnitude of the magnetic field 3.0 mm from the axis?
a. 0.82 mT
b. 0.93 mT
c. 0.70 mT
d. 0.58 mT
e. 0.40 mT
B
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In a condenser of a refrigeration unit, saturated vapor R-134a flows at 0.5 m/s into a 0.5 cm diameter horizontal tube. The tube inside surface temperature is 30ºC and the R- 134a is at 80ºC. Estimate the convective heat transfer coefficient and the expected tube length required for complete condensation of the R-134a. Use hnfg of 106.3 kJ/kg, ?f of 927.6 kg/m3, ?g of 153.8 kg/m3, and cp, ?, and ? at 400C.
What will be an ideal response?
Diffraction Gratings: A diffraction grating with 396 lines/mm is illuminated with light of wavelength 343 nm. What is the angular separation between the two second-order bright fringes?
A. 31.5° B. 15.8° C. 32.9°
The making of abundant iron nuclei is typical of:
A) planetary nebula ejection. B) the helium flash. C) all novae. D) type I supernovae. E) type II supernovae.
Consider a situation where a constant force of 25 N acts on an object having a mass of 2 kg for 3 seconds.What is the magnitude of the change in the object's momentum?
a. 150 kg m/s b. 50 kg m/s c. 75 kg m/s d. undetermined—not enough information given e. none of the above