A long conducting bar moves with a constant velocity in a uniform magnetic field. The bar and its velocity are perpendicular to the magnetic field as shown. Which of the following statements are true?
A. At steady state there is an electric field in the bar.
B. At steady state there is a current in the bar.
C. At steady state there is a magnetic force on bar.
1.A only
2.B only
3.C only
4.A and B only
5.A and C only
6.B and C only
7.A, B, and C
1
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Ariel claims that a pulse is described by the equation 
where x and y are measured in cm and t in s. Miranda says that it is not possible to represent a pulse with this function because a wave must be a function of x + vt or x?vt. Which one, if either, is correct, and why?
A.
B.
C.
D.
E.
is infinite when x = 0.When you look at a single slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is increased,
a. the pattern shrinks in size. (central maximum less wide; other maxima in closer to it) b. the pattern increases in size. (central maximum wider; other maxima farther from it) c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
Why don't we expect to find life on planets orbiting high-mass stars?
A) The stars are too hot to allow for life. B) Planets cannot have stable orbits around high-mass stars. C) The high-mass stars emit too much ultraviolet radiation. D) The lifetime of a high-mass star is too short.
A 1.00 kg stone attached to a 1.00 m long string is traveling in a vertical circular orbit. What is the minimum tangential velocity at the top of the vertical circular orbit to keep the string from going slack?
A. 5.63 m/s B. 5.31 m/s C. 5.00 m/s D. 4.50 m/s E. 3.13 m/s