Calculate the current through a 10.0-m long 22 gauge (having radius 0.321 mm) nichrome wire if it is connected to a 12.0-V battery
The resistivity of nichrome is 100 × 10-8 ? ? m.
A) 776 mA B) 30.9 A C) 17.5 A D) 388 mA E) 61.8 A
D
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The direction of polarization of an electromagnetic wave is taken by convention to be
A. the electric field direction.
B. the magnetic field direction.
C. the direction of 
D. perpendicular to the electric field direction.
E. None of these choices are correct.
If high tide is at noon, the next high tide will be at
A. 6 am B. noon tomorrow. C. midnight. D. 6 pm
An electron is confined in a harmonic oscillator potential well. What is the longest wavelength of light that the electron can absorb if the net force on the electron behaves as though it has a spring constant of 74 N/m?
(mel = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 1.055 × 10-34 J ? s, h = 6.626 × 10-34 J ? s) A) 210 nm B) 200 nm C) 220 nm D) 230 nm
Why can nothing (including light) escape a black hole?
A: Because of the gravitational redshift of light B: The required escape velocity exceeds the speed of light C: Because all material is tidally distorted and destroyed D: Because of the extreme electromagnetic forces E: Because the mass is greater than four solar masses