Polystyrene has a _________strain to fracture at room temperature relative to that of most other thermoplastic polymers.
Fill in the blank(s) with the appropriate word(s).
low
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A mid-ocean ridge is formed at the boundary of two plates
a. that are separating from one another. b. that are sliding horizontally past one another. c. where one is pushing over the top of the other. d. that are basically at rest.
An object is placed at the focal point of a converging lens and the light rays from the lens will be parallel to the principal axis. The object is now moved closer to the lens. Which statement is true about the light rays from the lens?
A. the will remain parallel to the principle axis B. they converge toward each other C. they emerge parallel to each other but not the principle axis D. they diverge from each other
When water changes to ice, energy is _______.
a. released by the water b. changed to a different form c. absorbed by the water d. None of the answers is correct.
Many young stars in new clusters appear to be surrounded by a blue, nebulous haze. The physical process that produces this blue nebulosity is
a. mission from transitions in hydrogen atoms, predominantly in the blue part of the visible spectrum. b. the preferential scattering of blue starlight by very fine dust grains in the interstellar medium. c. emission from molecular species, particularly methane, CH4, whose emission bands are in the blue part of the visible spectrum. d. thermal (blackbody) emission from interstellar gas heated to 10,000 K by UV radiation from nearby hot, young stars