What evidence did astronomers use to prove jets travel in opposite directions?
a. spectral lines from fast-moving red- and blue-shifted ionized gas
b. gamma ray emission spectra
c. magnetic tubes in accretion disks
d. mass transfer from a binary star to a compact companion
e. pulsar rotation periods
a
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Three identical point charges Q are placed at the vertices of an equilateral triangle (length of each side = 2.0 m). If Q = 60 ?C, what is the magnitude of the electrostatic force on any one of the charges?
A. 25 N B. 19 N C. 14 N D. 22 N E. 16 N
The probability of finding a particle with wave function 
in an interval ?x is given by
A. 
.
B. 
?x.
C. 
(?x)2
D. 
?x.
E. 
(?x)2
An air-filled parallel-plate capacitor is constructed with a plate area of 0.40 m2 and a plate separation of 0.10 mm
It is then charged to a potential difference of 12 V? (?0 = 8.85 × 10-12 C2/N ? m2 ) (a) How much charge is stored on each of its plates? (b) How much energy is stored in it?
A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton due to this field? (e = 1.60 × 10-19 C)
What will be an ideal response?