The science of increasing the strength of materials is the science of controlling the structure and _____________in materials.
Fill in the blank(s) with the appropriate word(s).
defects
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_____, the largest of Saturn's moons, has an atmosphere composed mostly of nitrogen with traces of argon and methane
A) Ganymede B) Miranda C) Europa D) Titan
Compared to the Earth, Mars has experienced wild swings in its axis tilt over relatively short time periods. This is because of its
A) proximity to Jupiter and its lack of a large moon B) greater distance from the Sun C) slower rotation rate D) small size
A 30-kg child runs at 3.0 m/s and jumps onto a shopping cart and holds on for dear life. The cart has a mass of 20 kg. Assuming the child rides on the cart after the collision, the speed of the child and shopping cart just after the child jumps on is
A. zero. B. 3.0 m/s. C. 2.5 m/s. D. 1.8 m/s.
A hydrogen atom is excited to the n = 11 level. Its decay to the n = 7 level is detected in a photographic plate. What is the wavelength of the light photographed? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A) 7,510 nm B) 4,670 nm C) 12,400 nm D) 4,380 nm