Viscosity: Two horizontal pipes have the same diameter, but pipe B is twice as long as pipe A. Water undergoes viscous flow in both pipes, subject to the same pressure difference across the lengths of the pipes. If the flow rate in pipe B is Q = 
what is the flow rate in pipe A?
A. 2Q
B. 4Q
C. 8Q
D. 16Q
E. Q
Answer: A
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The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels
Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next? A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) A different electron drops into level 1, since it is now unoccupied. D) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.62 × 10-19 J B) 0.21 × 10-19 J C) 0.36 × 10-19 J D) 0.48 × 10-19 J E) 0.33 × 10-19 J
For a transverse mechanical wave, the particle motion is
a. both parallel and perpendicular to the direction of the wave velocity. b. parallel to the direction of the wave velocity. c. perpendicular to the direction of the wave velocity. d. in all directions.
Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque?
A) the first at the midpoint B) the second at the doorknob C) both exert equal non-zero torques D) both exert zero torques E) additional information is needed