The internal energy of air can be increased by
a. compressing it. b. allowing heat to flow into it.
c. lifting it. d. allowing it to expand.
a, b
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What would happen in the Sun if the temperature of the core decreased?
A) The fusion rate increases, then the core expands and cools. B) The fusion rate increases, then the core shrinks and heats. C) The fusion rate decreases, then the core shrinks and heats. D) The fusion rate decreases, then the core expands and heats.
A laser shines 630-nm light through a grating producing a first-order (m = 1) maximum at an angle of 30°. A second laser produces a first-order maximum with the same grating at 20°. What is the wavelength emitted by the second laser?
a. 945 nm b. 651 nm c. 420 nm d. 431 nm
Volcanoes are so numerous along the margins of the Pacific Ocean that the region has been dubbed the ______________
Fill in the blank(s) with correct word
What is the central equation of mass-energy equivalence?
A) W = Fd B) KE = ½ mv2 C) m = F/a D) E = mc2