The energy to extend a crack in a stressed material comes from _________of stresses along the crack surface.
Fill in the blank(s) with the appropriate word(s).
relaxation
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A diffraction grating has 6.00 × 103 lines per centimeter ruled on it
What is the angular separation between the second and the third orders on the same side of the central order when the grating is illuminated with a beam of light of wavelength 550 nm? A) 20.5° B) 30.5° C) 40.6° D) 50.5°
Materials A, B, and C have R values of 1, 4, and 8 ft2-°F-hr/Btu, respectively. If the rate of heat transfer through material A alone is 20 Btu/hr, then the rate of heat transfer through the combination of A, B and C is _____
a. 1.5 b. 2.5 c. 4.0 d. 7.0 e. 80 Btu/hr
A Geiger counter registers a count rate of 8,000 counts per minute from a sample of a radioisotope. The count rate 24 minutes later is 1,000 counts per minute. The half-life of the radioisotope is __________
Fill in the blank(s) with correct word
A big and a small person wish to parachute at equal terminal velocities. The big person should
A) jump first. B) jump lightly. C) pull upward on the supporting strands to decrease the downward net force. D) get a larger parachute. E) none of the above