A CD has a diameter of 12.0 cm. If the CD is rotating at a constant angular speed of 200 revolutions per minute, then the tangential velocity of a point on the circumference is
A. 1.06 m/s.
B. 1.26 m/s.
C. 1.39 m/s.
D. 1.62 m/s.
E. 1.32 m/s.
B. 1.26 m/s.
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Resistivity and Temperature: The temperature coefficient of resistivity of platinum is 3.9 × 10-3/C°. If a platinum wire has a resistance of R at a temperature of 23°C, to what temperature must it be heated in order to double its resistance to 2R?
A. 280°C B. 300°C C. 730°C D. 930°C
The first law of thermodynamics is a restatement of the conservation of
A) momentum. B) energy. C) electric charge. D) all of the above E) none of the above
A statue that is 10.4 cm tall is placed 4.8 cm in front of a concave lens. The image is 4.0 cm from the lens. How tall is the image?
A) 13 cm B) 8.7 cm C) 5.4 cm D) 1.8 cm
Estimate the maximum cooling rate for a jominy bar at a jominy distance of 15 cm and when does it occur?
FIG 3-23
Jominy end-quench test
