What is the resistance of a cylindrical metal rod 1.0 cm in diameter and 45 m long, if the resistivity of the metal is 1.4 × 10-8 ? ? m?
A) 0.0063 ?
B) 0.0080 ?
C) 0.80 ?
D) 6.3 ?
B
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The big bang only created hydrogen and helium (with miniscule amounts of lithium) because____
a. gamma ray photons disrupt large nuclei more easily b. antimatter is attracted to large nuclei, leaving only light nuclei c. heavier elements can only be formed through fusion d. elements with an atomic weight of 5 or 8 are unstable e. temperatures were high enough to fuse hydrogen, but not helium
Shown below are the four terrestrial planets of our solar system. Assume that all the planets started out equally hot inside. Rank the planets based on their expected cooling rates, from fastest cooling to slowest cooling.
Applications to Astronomy: It can be shown that the approximate age of the universe is 1/H, where H is the Hubble constant. Taking H = 20 
, estimate the age of the universe, in years. (1 ly = 9.46 × 1015 m)
A. 15 thousand years B. 15 million years C. 15 billion years D. 50 billion years
What is the slit spacing of a grating necessary so that 600-nm light will produce a first order principal maximum at 25.0° away from the centerline?
A) 1.42 ?m B) 2.01 ?m C) 3.12 ?m D) 4.12 ?m E) 5.44 ?m