The spectral lines of white dwarf stars are redshifted, because their high gravity reduces the energy carried by light escaping from the white dwarf.
Answer the following statement true (T) or false (F)
True
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A Cu-Ni alloy is produced that is 43 atom % Ni. At a temperature of 1260°C:
(a) What phases are present? (b) What are their chemical compositions? (c) What is the atom fraction of each phase present?
A _____ is an electronic device consisting of a large array of light-sensitive elements used to record very faint images
A) photometer B) charge-coupled device C) spectrograph D) photographic plate
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.
Consider the motion of a 1.00-kg particle that moves with potential energy given by U(x) = -(2.0 J?m)/x + (4.0 J?m2)/x2. Suppose the particle is moving with a speed of 3.00 m/s when it is located at x = 1.00 m
What is the speed of the object when it is located at x = 5.00 m? A) 2.13 m/s B) 3.00 m/s C) 4.68 m/s D) 3.67 m/s E) This question cannot be answered. You need to know the direction of the velocity, not just the speed, when the particle is located at x = 1.00 m.