A spaceship encounters a single plane of charged particles, with the charge per unit area equal to ?. The electric field a short distance above the plane has magnitude ____ and is directed ____ to the plane.
A.
, parallelB.
, perpendicularC.
, parallelD.
, perpendicularE.
, parallelAnswer: B
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"Spurs" are probably the result of ____
a. self-sustaining star formation b. spiral density waves c. differential rotation d. the central galactic bar e. the short lifetime of O stars
An amount of a monatomic ideal gas is taken around the process shown. The amount of heat extracted during process B-C is:
1.10 J
2.20 J
3.15 J
4.45 J
5.60 J
6.none of the above
7.cannot be determined
A star with a mass of 10 to 20 solar masses will produce a(n) _______________ remnant after a supernova explosion
Fill in the blank(s) with correct word
A 0.120-pF parallel-plate capacitor is charged to a potential difference of 10.0 V and then disconnected from the battery. A cosmic ray burst creates 1.00 × 106 electrons and 1.00 × 106 positive charges between the plates. If the charges do not recombine, but reach the oppositely charged plates, by how much is the potential difference between the capacitor plates reduced?
A. 1.33 V B. 7.34 V C. 8.67 V D. 1,330 V E. 8,670 V