Astronomers know the universe is expanding because
A) everything is moving away from us.
B) all stars are moving away from us.
C) most galaxies are moving away from us.
D) galaxies farther away are moving away from us faster.
E) there is a cosmic microwave background.
D
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Power: A resistance heater is rated at 1200 W when operating at 110 V dc. What current will it draw?
A. 0.090 A B. 1.0 A C. 11 A D. 12 A
Double-Slit Interference: In a two-slit experiment using coherent light, the distance between the slits and the screen is 1.10 m, and the distance between the slits is 0.0400 mm. If the second order bright fringe is measured to be 4.20 cm from the centerline on the screen, what is the wavelength of light?
A. 200 nm B. 381 nm C. 401 nm D. 620 nm E. 763 nm
About what percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 0 percent B) 0.1 percent C) 2 percent D) 20 percent E) 80 percent
When a 14.0-A current flows through an 8.00-? device for 24.0 hours, how much does this cost if energy costs $0.0900 per kW ? h?
A) $0.24 B) $3.39 C) $2.16 D) $1.04