Two long parallel wires carry currents of 20 A and 5.0 A in opposite directions. The wires are separated by 0.20 m. What is the strength of the magnetic field midway between the two wires? (?0 = 4? × 10-7 T ? m/A)
A) 2.0 × 10-5 T B) 3.0 × 10-5 T C) 1.0 × 10-5 T D) 4.0 × 10-5 T E) 5.0 × 10-5 T
E
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All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) The axis tilt of Mars is thought to change significantly with time. B) Mars lost any global magnetic field that it may once have had. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
The average molecular translational kinetic energy of a molecule in an ideal gas is
A.
kBT.B.
RT.C.
kBT.D.
RT.E.
kBT, where n = number of internal degrees of freedom.Light of wavelength 600 nm in air goes into a medium where the index of refraction is 1.73. What is the frequency of this light in the medium?
A. 
B. 
C. 
D. 
E. 
Nylon is a polyamide; Dacron is a(n) ______________
Fill in the blank(s) with correct word