The current in an electron beam in a cathode-ray tube is measured to be 50 µA. How many electrons hit the screen in 7.0 s? (e = 1.6 × 10^?19 C)
a. 4.4 × 10^11 electrons
b. 3.5 × 10^13 electrons
c. 2.2 × 10^15 electrons
d. 3.1 × 10^18 electrons
e. 2.7 × 10^17 electrons
c
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The search for black holes involves searching for
a. single stars that emit large amounts of X-rays. b. X-ray binaries where the compact companion has a mass in excess of 3 Mo. c. large spherical regions from which no light is detected. d. pulsars with periods less than one millisecond. e. pulsars that are orbited by planets.
The emphasis of the orange-and-apple sequence in your text is
A) to define systems. B) that actions equal reactions. C) that forces produce accelerations. D) defining friction as a force. E) that mass is not a force.
What is the root-mean-square value of the following velocity components: 2.0 m/s, -3.0 m/s, and 4.0 m/s?
A) 5.4 m/s B) 1.9 m/s C) 3.1 m/s D) 3.3 m/s E) 1.0 m/s
At what point is the charge per unit area greatest on the surface of an irregularly shaped conducting solid?
a. where surface curves inward b. where surface is flat c. where curvature is least d. where curvature is greatest