Which star shows the least motion in the northern sky over the course of an hour?
What will be an ideal response?
Polaris, the North Star, lies within a degree of the celestial pole, and does not move noticeably with the naked eye over an entire night.
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Resistors in Combination: What is the equivalent resistance of the circuit shown in the figure? The battery is ideal and all resistances are accurate to 3 significant figures.
A. 950 ? B. 450 ? C. 392 ? D. 257 ?
What gets left behind in the middle of a planetary nebula?
A.) A newborn star. B.) A white dwarf. C.) A neutron star. D.) A black hole. E.) None of the above.
Nearly all life on Earth passes on its heredity using
A) lipids B) RNA C) DNA D) proteins
A metal has a work function of 4.50 eV. Find the maximum kinetic energy of the photoelectrons if light of wavelength 250 nm shines on the metal
(1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.00 eV B) 0.37 eV C) 0.47 eV D) 0.53 eV