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.

Physics & Space Science

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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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science