The SI units of velocity are
a. mi/h
b. km/h
c. m/s2
d. m/s
e. none of the above
C
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A type of transmission line for electromagnetic waves consists of two parallel conducting plates (assumed infinite in width) separated by a distance a
Each plate carries the same uniform surface current density of 16.0 A/m, but the currents run in opposite directions. What is the magnitude of the magnetic field between the plates at a point 1.00 mm from one of the plates if a = 0.800 cm? (?0 = 4? × 10-7 T ? m/A) A) 3.20 × 10-3 T B) 1.00 × 10-5 T C) 4.63 × 10-5 T D) 2.01 × 10-5 T E) 7.07 × 10-4 T
Ten meter long steel railroad rails are laid end to end, with no space between, on a hot day when the temperature is 115.°F
Six months later the temperature has dropped to -2.°F. How much space now exists between each rail? [ linear expansion coef. for steel is 12. × 10-6 C°-1]
A stunt pilot weighing 0.70 kN performs a vertical circular dive of radius 0.80 km. At the bottom of the dive, the pilot has a speed of 0.20 km/s which at that instant is not changing. What force does the plane exert on the pilot?
a. 3.6 kN up b. 4.3 kN up c. 2.9 kN down d. 2.9 kN up e. 5.8 kN down
The scientific method is most effective in
A) making hypotheses. B) gaining, organizing, and applying new knowledge. C) discovering new things. D) making theories. E) performing experiments.