When a bar magnet is thrust into a coil of wire, the coil
A) attracts the magnet as it enters.
B) repels the magnet as it enters.
C) both of these
D) none of the above
Answer: B
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The stage II creep rate in metals and ceramics at constant stress and temperature is
(a) Transient and decreasing. (b) Increasing toward rupture. (c) A constant. (d) Parabolic.
Claudius Ptolemy created an elaborate geometrical and mathematical model to explain details of the observed motions of the planets while assuming:
A) Earth was motionless at the center of the Universe. B) the Sun was at the center of the Universe. C) Earth was part of a galaxy. D) there were many galaxies in the Universe.
How much heat (in kcal) must be removed to make ice at ?10°C from 2 kg of water at 20°C? (The specific heat of ice is 0.50 cal/g?°C.)
A. 190 B. 200 C. 240 D. 210 E. 50
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.