A. +x direction
B. -x direction
C. +y direction
D. -y direction
E. +z direction
F. -z direction
T. The field is zero.
F. -z direction
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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.
A concave mirror with focal length 16.0 cm is placed 45.0 cm to the left of the object. A convex lens of focal length 15.0 cm is placed 6.0 cm to the right of the object. Where is the image formed by both the mirror and the lens?
a. 9.5 cm to the right of the object b. 35.1 cm to the right of the lens c. 15.5 cm to the right of the object d. 37.9 cm to the right of the lens e. 16.0 cm to the right of the lens
An Earth satellite in an elliptical orbit travels fastest when it is
A) nearest the Earth. B) farthest from the Earth. C) neither of these
Dark lines that appear in the spectra observed in stellar atmospheres indicate the fact that
A. atoms that would produce light of the darkened frequency bands aren’t present in the atmosphere. B. atoms are present in the atmosphere that have electrons that are absorbing photons of those frequencies. C. atoms are present in the atmosphere that have electrons that are emitting photons of those frequencies D. atoms that would produce light of the darkened frequency bands are forbidden from doing so because of quantum effects.