Enough brown dwarfs have been found to account for most of the dark matter present in galaxies
Indicate whether the statement is true or false
False
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A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor.
A. 0.96 mT B. 1.7 mT C. 0.55 mT D. 1.2 mT E. 0.40 mT
A 0.30-m-radius automobile tire rotates how many rad after starting from rest and accelerating at a constant 2.0 rad/s2 over a 5.0-s interval?
a. 12.5 rad b. 25 rad c. 2.0 rad d. 0.50 rad
In outer space, you observe a straight stream of electrons flowing past you at 14.5 miles per second, about the same speed that Mars moves on its orbit around the sun. 
You maneuver your spacecraft to face the current so that the electrons are moving from left to right and so that you are 10 m from the stream. Now you fire your rockets and boost your speed so that you are also moving at 14.5 miles per second, exactly at the same speed and direction as the electrons. In what direction does a compass needle point now?
A. right 
B. down 
C. left 
D. up 
E. You observe no magnetic field
The quark and antiquark in a meson are always of the same flavor
Indicate whether the statement is true or false