A large 75-kg lighting fixture can be hung from wires of identical size and shape made of aluminum, brass, or copper. The values of Young's modulus for these metals are 0.70 × 1011 Pa (aluminum), 0.91 × 1011 (brass), and 1.1 × 1011 (copper)
Which wire would stretch the least distance?
A) brass B) copper
C) aluminum D) They will all stretch the same distance.
B
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"Weightlessness" occurs when an object
a. has zero acceleration. b. is in free fall. c. is midway between Earth and the Moon. d. loses weight.
Three identical bar magnets, each 2 cm long, are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends. They are constrained so they cannot rotate, but they can slide along the straight line. The left magnet has its north pole nearest the north pole of the middle magnet, and the right magnet has its south pole toward the middle magnet's south
pole. Once they are in place and released from rest, which of the following best describes the motion of the magnets? a. The end magnets will move away from the center magnet. b. The magnets will not move since they are equally spaced. c. The magnets will snap together. d. None of the above would happen.
Which of the following values can be taken by the electron spin quantum number, ms?
A) ±1/2 B) 0 C) ±1 D) ±2 E) ±3
For photovoltaic cells, the potential difference for two silicon cells in series will at most be ________
a. 0.1 b. 0.5 c. 1.0 d. 2.0 e. 5.0 volts.