A charged particle moving along the +x-axis enters a uniform magnetic field pointing along the +z-axis. Because of an electric field along the +y-axis, the charge particle does not change velocity. What is the sign of this particle?
A) positive
B) negative
C) The particle could be either positive or negative.
D) None of the above choices is correct.
C
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It was the Chinese who provided critical ancient data on supernovae and comets
Indicate whether the statement is true or false
Frank says that if you release the string when swinging a ball in a horizontal circle, the ball flies out in the radial direction defined by the string at the instant you release the ball. John says that it flies out along a tangent line perpendicular to the string, and that it then drops straight down to the ground. Which one, if either, is correct?
a. Frank, because the centrifugal force is no longer counteracted by the string. b. Frank, because balls naturally fly straight out. c. John, because there is no centrifugal force. d. John, because balls fall straight down when released. e. Neither, because although there is no centrifugal force, and the ball's velocity is tangent to the circle at the instant of release, the ball then follows a parabolic trajectory.
In defining a disease to be studied, epidemiologists use the term disease broadly, but ________________ is a more accurate but cumbersome description of what is to be studied.
What will be an ideal response?
The last quasar probably died out a billion years ago, for none lie within a billion light years of us
Indicate whether the statement is true or false