The figure shows a cross section of three parallel wires each carrying a current of 5.0 A out of the paper. If the distance R = 6.0 mm, what is the magnitude of the magnetic force on a 2.0-m length of any one of the wires?
a.
2.5 mN
b.
3.3 mN
c.
2.2 mN
d.
2.9 mN
e.
1.7 mN
d
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The greenhouse effect keeps Venus hot because
a. the atmosphere contains free oxygen. b. the atmosphere is predominently carbon dioxide. c. the surface converts infrared into visible radiation. d. the surface is free of sulfur compounds. e. the magnetic field traps a large number of particles from the solar wind.
Life forms became large and complex during the ______________ period
Fill in the blank(s) with correct word
A galaxy with almost no starlight but plenty of cool clouds of hydrogen gas would be best observed with a(n) ________ telescope.
A. optical (visible-light) B. radio C. X-ray D. infrared
In quantum mechanics there is a process by which an electron can start in a region of relatively weak forces, enter a classically forbidden region, and then reemerge on the other side of that region. The electron, it can be said, travels through a "wall." How do scientists commonly refer to this process?