A brass rod, 4.0 m long and with a cross sectional area of 9.2 × 10-6 m2 is subjected to a tension of 6.0 × 103 N/m2
The Young's modulus for brass is 9.0 × 1010 N/m2, and the Poisson ratio is 0.48. By how much does the volume of the rod change?
A)
6.3 × 10-7 m3
B)
0.029 m3
C)
2.7 × 10-7 m3
D)
4.0 × 10-7 m3
E)
5.2 × 10-7 m3
E
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Diffraction Gratings: The distance between the ruled lines on a diffraction grating is 1770 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band. What is the longest wavelength that appears in the third order spectrum?
A. 590 nm B. 570 nm C. 550 nm D. 530 nm E. 610 nm
Short-period comets, such as Halley's Comet, are believed to come from the ______________
Fill in the blank(s) with correct word
Why do we believe that starburst galaxies represent a temporary stage in galaxy evolution?
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A small metal sphere is suspended from the conducting cover of a conducting metal ice bucket by a non-conducting thread. The sphere is given a negative charge before the cover is placed on the bucket. The bucket is tilted by means of a non-conducting material so that the charged sphere touches the inside of the bucket. Which statement is correct?
a. The negative charge remains on the metal sphere. b. The negative charge spreads over the outside surface of the bucket and cover. c. The negative charge spreads over the inside surface of the bucket and cover. d. The negative charge spreads equally over the inside and outside surfaces of the bucket and cover. e. The negative charge spreads equally over the sphere and the inside and outside surfaces of the bucket and cover.