In axial loading parallel to the fibers of a uniaxial continuous composite material, it is the material with the lowest _________to fracture that fails first.
Fill in the blank(s) with the appropriate word(s).
strain
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Helium flash occurs
a. because helium is very explosive and cannot be controlled when the nuclear reactions occur. b. because degenerate electrons in the core do not allow the core to expand as it heats up. c. in Cepheid variables. d. in stars with masses less than 0.4 M. e. none of the above
As shown in the above image, rising material is flowing from the penumbra and into the umbra where it sinks
a. True
b. False
Photon Energy: A laser emits a pulse of light that lasts 10 ns. The light has a wavelength of 690 nm, and each pulse has an energy of 480 mJ. How many photons are emitted in each pulse? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.7 × 1018 B. 2.1 × 1027 C. 2.6 × 1037 D. 3.1 × 1043
In order to produce an image double the size of an object with a converging lens of focal length f, what object distance should be used?
A. f B. f/2 C. 2f D. 2f/3 E. 3f/2