A soap bubble (n = 1.35) is floating in air. If the thickness of the bubble wall is 115 nm, what visible light wavelength is most strongly reflected?
621 nm (red)
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What is the first known human-made material?
(a) Ceramic (b) Bronze (c) Flint arrowheads (d) Copper
Angular Quantities: A chicken is running in a circular path with an angular speed of 1.52 rad/s. How long does it take the chicken to complete one revolution?
A. 4.13 s B. 2.07 s C. 118 s D. 4.77 s E. 8.26 s
A nichrome wire and an aluminum wire, each with the same initial resistance, have the same change in resistance when heated separately. (rAl = 2.82 × 10^-8 W × m; aAl = 3.9 × 10^-3 / °C; rnichrome = 1.50 × 10^-6 W × m; anichrome = 0.40 × 10^-3 / °C.) The ratio of the temperature change of the nichrome wire to the temperature change of the aluminum wire is
a. 0.019. b. 0.10. c. 0.18. d. 9.8. e. 53.
Power is
a. work divided by time. b. velocity multiplied by time. c. momentum divided by time. d. energy multiplied by time.