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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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.
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.
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.