A beam of electrons is sent in the positive x direction in a region with a uniform magnetic field B in the positive y direction and a uniform electric field E in the positive z direction. At which of the following speeds would the electrons be deflected in the positive z direction?
a. v = E/B
b. There is no speed for which this will happen.
c. v < E/B
d. v > E/B
B
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Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion?
A) In equal times its speed changes by equal amounts. B) In equal times its velocity changes by equal amounts. C) In equal times it moves equal distances. D) A graph of its position as a function of time has a constant slope. E) A graph of its velocity as a function of time is a horizontal line.
The Harvard College Observatory Computers from c. 1880 into the early 20th century were:
A) the first digital computers. B) not much different than cash registers. C) functionally similar to the modern 4- function calculator. D) a group of women who made important contributions to astronomy. E) mechanically operated adding machines.
Sodium metal is
A) oxidized in the production of aluminum. B) reduced in the production of aluminum. C) both oxidized and reduced in the production of aluminum. D) neither oxidized nor reduced in the production of aluminum.
How much compressional stress builds up in a thick aluminum bar held between 2 immovable walls if the temperature increases by 20. C°? (? = 24. × 10-6 C-1, Y = 7 × 1010 N/m2)
A) 34. × 105 N/m2 B) 34. × 107 N/m2 C) 34. × 106 N/m2 D) 34. × 104 N/m2 E) 34. × 108 N/m2