Suppose the ends of a 30-m-long steel beam are rigidly clamped at 0°C to prevent expansion. The beam has a cross-sectional area of 30 cm2 . What force against the clamps does the beam exert when it is heated to 40°C? (?Steel = 1.1 × 10^?5/°C, Ysteel = 20 × 10^10 N/m2)
2.6 × 10^5 N
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The totally eclipsed Moon glows coppery red because sunlight reaches the Moon's surface after passing through Earth's atmosphere
a. True b. False Indicate whether the statement is true or false
Two lenses, the first with focal length 10.0 cm and the second with focal length -12.5 cm, are separated by 20.0 cm. An object, 2.40 cm tall, is 15.0 cm in front of the first lens. Which of the following characteristics does the final image have?
A. real and upright B. real and inverted C. virtual and upright D. virtual and inverted E. virtual and diminished in size
Metal alloys dispersion strengthened with oxide particles are usually produced by _________metallurgy techniques.
Fill in the blank(s) with the appropriate word(s).
The Universe has____
a. an edge, does not have a center, and is finite b. no edge, does not have a center, and is finite c. an edge, has a center, and is finite d. an edge, has a center, and is infinite e. no edge, does not have a center, and is infinite