If a metal sheet containing a tiny hole is heated (without damaging it) and therefore expands, what happens to the angular location of the first-order diffraction maximum?
A) It moves toward the centerline.
B) It moves away from the centerline.
C) It doesn't change.
A
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While a rock is falling straight down with negligible air resistance, it has
A) an unchanging speed. B) an increasing speed. C) a decreasing speed. D) zero speed. E) None of the above.
An atom has subshells 
in the ground state. What is its atomic number?
A. 10 B. 18 C. 20 D. 30 E. More information is needed.
The flow patterns found on the surface of Mars and the number of craters on top of them suggest that
a. Mars is today a liquid water-rich world. b. the climate on Mars was different billions of years ago. c. volcanism is occurring on Mars. d. the polar caps are made of liquid water. e. all of the above
Torque: A flat circular loop of wire of radius 0.50 m that is carrying a 2.0-A current is in a uniform magnetic field of 0.30 T. What is the magnitude of the magnetic torque on the loop when the plane of its area is perpendicular to the magnetic field?
A. 0.00 N ? m B. 0.41 N ? m C. 0.47 N ? m D. 0.52 N ? m E. 0.58 N ? m