Left-hand rule is used to ________
A) determine the polarity of the magnetic field in an electromagnet
B) determine the amount of magnetic flux in a coil
C) determine the number of coils in an electromagnet
A
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____ drawings are a one-dimensional projection that shows the side of a structure or house, as seen head on and facing a certain direction.
a. Floor b. Plot c. Elevation d. Electrical
A recent attempt to circumnavigate the world in a balloon used a helium filled balloon whose volume was 7240 m3 and surface area was 1800 m2. The skin of this balloon is 2 mm thick and is made of a material whose helium diffusion coefficient is 1?10-9 m2/s. The molar concentration of the helium at the inner surface of the balloon skin is 0.2 kmol/m3 and the molar concentration at the outer surface is extremely small. The rate at which helium is lost from this balloon is
(a) 0.26 kg/h (b) 1.5 kg/h (c) 2.6 kg/h (d) 3.8 kg/h (e) 5.2 kg/h
When the performances of systems are analyzed, it is necessary to:
A) Analyze the systems the same amount of time to ensure an accurate analysis. B) Analyze the systems at the same location to ensure an accurate analysis. C) Analyze the systems under the same conditions to ensure an accurate analysis. D) Analyze the systems at the same time of day to ensure an accurate analysis.
A shielded sensor uses the ____________________ (radial, axial) approach by detecting objects _________________________ (only in front of the head, to the front or side of the head).
Fill in the blank(s) with the appropriate word(s).